Stockholders' Equity (Deficit) - Additional Information (Detail)
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12 Months Ended |
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Aug. 21, 2020
USD ($)
$ / shares
shares
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Aug. 14, 2020
$ / shares
shares
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Aug. 31, 2019
$ / shares
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Jul. 09, 2019
shares
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Jul. 08, 2019
$ / shares
shares
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Oct. 31, 2018
$ / shares
shares
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Jun. 09, 2015
USD ($)
shares
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Dec. 31, 2020
USD ($)
d
Incentive_Plan
Directors
$ / shares
shares
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Dec. 31, 2019
USD ($)
Directors
$ / shares
shares
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Dec. 31, 2018
USD ($)
Directors
$ / shares
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Mar. 26, 2019
shares
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Warrants, exercise price | $ / shares |
$ 4.75
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Number of trading days | d |
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20
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Preferred stock, par value | $ / shares |
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$ 0.0001
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$ 0.0001
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Preferred stock, shares authorized |
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24,984,166
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24,984,166
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Number of stock incentive plans | Incentive_Plan |
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3
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Stock incentive plan expiration date |
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Aug. 31, 2015
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Share-based compensation expense | $ |
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$ 420,648
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$ 756,596
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$ 415,615
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Weighted average fair value of options granted | $ / shares |
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$ 0
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Number of outside directors granted quarterly fees | Directors |
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0
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0
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0
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Weighted average estimated fair value of stock options | $ / shares |
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$ 0
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$ 0
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$ 0
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Aggregate intrinsic values of options exercisable | $ |
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$ 98,129
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$ 15,564
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$ 15,564
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Aggregate intrinsic values of options outstanding | $ |
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98,129
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15,564
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15,564
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Aggregate intrinsic values of options exercised | $ |
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0
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0
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0
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Total fair value of shares vested | $ |
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$ 0
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0
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231,952
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Number of warrants |
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3,481,314
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Class of Warrant or Right, Number of Securities Called by Warrants or Rights |
1,901,989
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Sale of Stock, Number of Shares Issued in Transaction |
2,553,314
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Offering costs paid on sale of common stock | $ |
$ 300,000
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$ 89,642
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Net proceeds received from sale of stock | $ |
$ 11,200,000
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$ 11,315,000
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4,561,739
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Class of Warrant or Right, Number of Securities Called by Each Warrant or Right |
0.6
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Purchase price of warrant | $ / shares |
$ 4.543
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Offering Fee Included in Offering Expenses | $ |
$ 200,000
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Poplar Falls LLC [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Warrants, exercise price | $ / shares |
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$ 3.99
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Accounting Standards Update 2017-01 [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Percent of ownership acquired |
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79.90%
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Bismarck [Member] | Accounting Standards Update 2017-01 [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Percent of ownership acquired |
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79.90%
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Business combination number of shares issued or issuable |
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249,584
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Note And Warrant Purchase Agreement [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Warrants, exercise price | $ / shares |
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$ 4.67
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$ 5.756
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$ 12.00
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Number of warrants |
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65,625
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Warrants, expiration date |
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Aug. 14, 2023
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Jul. 21, 2021
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Jul. 12, 2024
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Class of Warrant or Right, Number of Securities Called by Warrants or Rights |
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131,996
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196,135
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Note And Warrant Purchase Agreement [Member] | Second Amendment Agreement [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Warrants, exercise price | $ / shares |
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$ 5.756
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Class of Warrant or Right, Number of Securities Called by Warrants or Rights |
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196,135
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2015 Stock Incentive Plan [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Award authorized by board |
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450,000
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Director Fees [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Share-based compensation expense | $ |
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675,000
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Series AA-2 Convertible Preferred Stock [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Preferred stock, par value | $ / shares |
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$ 0.0001
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Preferred stock, shares authorized |
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7,223,145
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Series AA-1 Convertible Preferred Stock [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Preferred stock, par value | $ / shares |
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$ 0.0001
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Preferred stock, shares authorized |
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8,427,004
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Preferred stock Liquidation preference accretion rate |
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8.00%
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Minimum [Member] | Series AA-2 Convertible Preferred Stock [Member] | Penelope Mining LLC [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Closing price of common stock | $ / shares |
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$ 15.12
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Maximum [Member] | Poplar Falls LLC [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Common stock and warrants sold |
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551,378
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Incentive Stock Options [Member] | 2015 Stock Incentive Plan [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Award authorized by board |
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450,000
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Additional shares authorized for stock-based compensation |
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200,000
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Incentive Stock Options [Member] | 2019 Stock Incentive Plan [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Award authorized by board |
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800,000
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Unvested Restricted Stock Awards Excluded from EPS [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Fair value of restricted stock, awards vested | $ |
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$ 653,653
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0
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323,614
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Fair value of unvested restricted stock awards | $ |
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$ 1,770,676
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$ 132,917
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$ 460,000
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Weighted-average grant date fair value of restricted stock awards | $ / shares |
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$ 4.00
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$ 0
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$ 0
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Weighted-average remaining contractual term |
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2 years
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9 months 18 days
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9 months 18 days
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Total unrecognized compensation cost related to unvested restricted stock awards | $ |
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$ 804,496
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Cuota Appreciation Rights [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Share-based compensation expense | $ |
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0
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Liability associated | $ |
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$ 0
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Cuota Appreciation Rights [Member] | Key Employee Plan [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Excersisable |
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0
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Vested and Outstanding |
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635,450
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Cuota Appreciation Rights [Member] | Non Employee Director Plan [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Vested and Outstanding |
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492,665
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Cuota Appreciation Rights [Member] | Carrying Value [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Value of cuotas of Oceanica | $ / shares |
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$ 3.00
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Cuota Appreciation Rights [Member] | Fair Value [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Value of cuotas of Oceanica | $ / shares |
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$ 1.00
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Cuota Appreciation Rights [Member] | Maximum [Member] | Key Employee Plan [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Award authorized by board |
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750,000
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Cuota Appreciation Rights [Member] | Maximum [Member] | Director Plan [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Award authorized by board |
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600,000
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Common Stock [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Common stock and warrants sold |
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700,000
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Repurchases of common stock, shares |
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700,000
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Purchase price of repurchased shares | $ / shares |
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$ 7.155
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Warrants, exercise price | $ / shares |
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$ 7.155
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Warrant Expiration Date |
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Nov. 02, 2023
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Warrant right exercise price description |
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The warrants have an exercise price of $7.155 per share of common stock and are exercisable in accordance with their terms at any time on or before the close of business on November 2, 2023.
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Class of Warrant or Right, Number of Securities Called by Warrants or Rights |
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56,228
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Common Stock [Member] | Incentive Stock Options [Member] | 2015 Stock Incentive Plan [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Exercise price of incentive option granted |
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With respect to each grant of an ISO to a participant who is not a ten percent stockholder, the exercise price shall not be less than the fair market value of a share on the date the ISO is granted. With respect to each grant of an ISO to a participant who is a ten percent stockholder, the exercise price shall not be less than one hundred ten percent (110%) of the fair market value of a share on the date the ISO is granted.
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Maximum aggregate number of Shares with respect to one or more Awards that may be granted to any one person during any calendar year |
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83,333
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Maximum aggregate amount of cash that may be paid in cash to any person during any calendar year | $ |
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$ 2,000,000
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Common Stock [Member] | Incentive Stock Options [Member] | Minimum [Member] | 2015 Stock Incentive Plan [Member] |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Eligible employee threshold percentage |
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0.00%
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Purchase price of common stock percentage |
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(110.00%)
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