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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Beginning Balance at Dec. 31, 2018 $ 146,006 $ 8 $ 741,246 $ (267) $ (594,981)
Beginning Balance, Shares at Dec. 31, 2018   79,087,734      
Stock-based compensation expense 1,351 $ 0 1,351 0 0
Exercise of warrants 35,151 $ 2 35,149 0 0
Exercise of warrants, Shares   17,589,250      
Exercise of stock options 4,070 $ 0 4,070 0 0
Exercise of stock options, Shares   1,986,300      
Vesting of restricted stock units (RSUs) 0 $ 0 0 0 0
Vesting of restricted stock units (RSUs), Shares   49,775      
Employee payroll taxes withheld related to vesting of RSUs and exercise of stock options (26) $ 0 (26) 0 0
Employee payroll taxes withheld related to vesting of RSUs and exercise of stock options, Shares   (38,906)      
Cumulative effect of the adoption of the new standard | Accounting Standards Update 2016-02 (920) $ 0 0 0 (920)
Other comprehensive (loss) income, net 61 0 0 61 0
Net loss (17,885) 0 0 0 (17,885)
Ending Balance at Mar. 31, 2019 167,808 $ 10 781,790 (206) (613,786)
Ending Balance, Shares at Mar. 31, 2019   98,674,153      
Beginning Balance at Dec. 31, 2019 $ 120,679 $ 10 782,965 (105) (662,191)
Beginning Balance, Shares at Dec. 31, 2019 98,460,404 98,460,404      
Stock-based compensation expense $ 445 $ 0 445 0 0
Vesting of restricted stock units (RSUs) 0 $ 0 0 0 0
Vesting of restricted stock units (RSUs), Shares   63,750      
Employee payroll taxes withheld related to vesting of RSUs and exercise of stock options (123) $ 0 (123) 0 0
Employee payroll taxes withheld related to vesting of RSUs and exercise of stock options, Shares   (25,722)      
Other comprehensive (loss) income, net (23) $ 0 0 (23) 0
Net loss (18,383) 0 0 0 (18,383)
Ending Balance at Mar. 31, 2020 $ 102,595 $ 10 $ 783,287 $ (128) $ (680,574)
Ending Balance, Shares at Mar. 31, 2020 98,498,432 98,498,432