Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Public Offering [Member] Common Stock [Member]	Public Offering [Member] Preferred Stock [Member]	Public Offering [Member] Treasury Stock [Member]	Public Offering [Member] Additional Paid-in Capital [Member]	Public Offering [Member] Retained Earnings [Member]	Public Offering [Member] AOCI Attributable to Parent [Member]	Public Offering [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Preferred Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Treasury Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Preferred Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2018															16,642	0	0
Balance at Dec. 31, 2018								$ 0	$ 0	$ 0	$ (7)	$ 7	$ 0	$ 0	$ 17	$ 0	$ 0	$ 676,572	$ (509,406)	$ 1,338	$ 168,521
Stock-based compensation															$ 0	$ 0	$ 0	2,981	0	0	2,981
Award of restricted stock units (in shares)															47	0	0
Award of restricted stock units															$ 0	$ 0	$ 0	1	0	0	1
Return of common stock to pay withholding taxes on restricted stock (in shares)															0	0	15
Return of common stock to pay withholding taxes on restricted stock															$ 0	$ 0	$ 0	(499)	0	0	(499)
Cancellation of treasury stock (in shares)															0	0	(15)
Cancellation of treasury stock															$ 0	$ 0	$ 0	0	0	0	0
Other comprehensive income (loss)															0	0	0	0	0	(1,949)	(1,949)
Net loss															$ 0	$ 0	$ 0	0	(22,525)	0	(22,525)
Exercise of stock options and warrants (in shares)															12	0	0
Exercise of stock options and warrants															$ 0	$ 0	$ 0	236	0	0	236
Balance (in shares) at Mar. 31, 2019															16,701	0	0
Balance at Mar. 31, 2019															$ 17	$ 0	$ 0	679,284	(531,924)	(611)	146,766
Balance (in shares) at Dec. 31, 2018															16,642	0	0
Balance at Dec. 31, 2018								$ 0	$ 0	$ 0	$ (7)	$ 7	$ 0	$ 0	$ 17	$ 0	$ 0	676,572	(509,406)	1,338	168,521
Net loss																					(140,469)
Balance (in shares) at Sep. 30, 2019															19,665	0	0
Balance at Sep. 30, 2019															$ 20	$ 0	$ 0	716,655	(649,866)	(3,041)	63,768
Balance (in shares) at Mar. 31, 2019															16,701	0	0
Balance at Mar. 31, 2019															$ 17	$ 0	$ 0	679,284	(531,924)	(611)	146,766
Stock-based compensation															$ 0	$ 0	$ 0	3,355	0	0	3,355
Award of restricted stock units (in shares)															14	0	0
Award of restricted stock units															$ 0	$ 0	$ 0	0	0	0	0
Other comprehensive income (loss)															0	0	0	0	0	1,240	1,240
Net loss															$ 0	$ 0	$ 0	0	(20,171)	0	(20,171)
Exercise of stock options and warrants (in shares)															25	0	0
Exercise of stock options and warrants															$ 0	$ 0	$ 0	297	0	0	297
Balance (in shares) at Jun. 30, 2019															16,740	0	0
Balance at Jun. 30, 2019															$ 17	$ 0	$ 0	682,936	(552,095)	629	131,487
Stock-based compensation															$ 0	$ 0	$ 0	3,391	0	0	3,391
Issuance of stock (in shares)															2,545	0	0
Issuance of stock															$ 3	$ 0	$ 0	23,722	0	0	23,725
Award of restricted stock units (in shares)															9	0	0
Award of restricted stock units															$ 0	$ 0	$ 0	0	0	0	0
Other comprehensive income (loss)															0	0	0	0	0	(3,670)	(3,670)
Net loss															$ 0	$ 0	$ 0	0	(97,771)	0	(97,771)
Exercise of stock options and warrants (in shares)															1	0	0
Exercise of stock options and warrants															$ 0	$ 0	$ 0	6	0	0	6
Issuance of common stock consideration of MST (in shares)															370	0	0
Issuance of common stock consideration of MST															$ 0	$ 0	$ 0	6,600	0	0	6,600
Balance (in shares) at Sep. 30, 2019															19,665	0	0
Balance at Sep. 30, 2019															$ 20	$ 0	$ 0	716,655	(649,866)	(3,041)	63,768
Balance (in shares) at Dec. 31, 2019															20,691	0	0
Balance at Dec. 31, 2019															$ 21	$ 0	$ 0	720,484	(663,600)	(1,370)	55,535
Stock-based compensation															$ 0	$ 0	$ 0	1,923	0	0	1,923
Issuance of stock (in shares)	14,122	7,937	0												7,030	0	0
Issuance of stock	$ 14	$ 79	$ 0	$ 13,432	$ 0	$ 0	$ 13,525								$ 7	$ 0	$ 0	11,205	0	0	11,212
Conversion of preferred stock to common stock (in shares)															3,053	(3,053)	0
Conversion of preferred stock to common stock															$ 3	$ (30)	$ 0	27	0	0	0
Exchange of shares for Series B Warrants (in shares)															2,041	0	0
Exchange of shares for Series B Warrants															$ 2	$ 0	$ 0	2,468	0	0	2,470
Award of restricted stock units (in shares)															141	0	0
Award of restricted stock units															$ 0	$ 0	$ 0	0	0	0	0
Return of common stock to pay withholding taxes on restricted stock (in shares)															0	0	28
Return of common stock to pay withholding taxes on restricted stock															$ 0	$ 0	$ 0	(33)	0	0	(33)
Cancellation of treasury stock (in shares)															0	0	(28)
Cancellation of treasury stock															$ 0	$ 0	$ 0	0	0	0	0
Other comprehensive income (loss)															0	0	0	0	0	(872)	(872)
Net loss															$ 0	$ 0	$ 0	0	(16,598)	0	(16,598)
Balance (in shares) at Mar. 31, 2020															47,078	4,884	0
Balance at Mar. 31, 2020															$ 47	$ 49	$ 0	749,506	(680,198)	(2,242)	67,162
Balance (in shares) at Dec. 31, 2019															20,691	0	0
Balance at Dec. 31, 2019															$ 21	$ 0	$ 0	720,484	(663,600)	(1,370)	55,535
Conversion of preferred stock to common stock (in shares)															7,900
Balance (in shares) at Jun. 30, 2020															56,903	0	0
Balance at Jun. 30, 2020															$ 57	$ 0	$ 0	754,818	(694,038)	(1,280)	59,557
Balance (in shares) at Dec. 31, 2019															20,691	0	0
Balance at Dec. 31, 2019															$ 21	$ 0	$ 0	720,484	(663,600)	(1,370)	55,535
Net loss																					(45,521)
Exercise of stock options and warrants (in shares)															4,900
Balance (in shares) at Sep. 30, 2020															99,879	0	0
Balance at Sep. 30, 2020															$ 100	$ 0	$ 0	770,368	(709,120)	821	62,169
Balance (in shares) at Mar. 31, 2020															47,078	4,884	0
Balance at Mar. 31, 2020															$ 47	$ 49	$ 0	749,506	(680,198)	(2,242)	67,162
Stock-based compensation															$ 0	$ 0	$ 0	1,933	0	0	1,933
Conversion of preferred stock to common stock (in shares)															4,884	(4,884)	0
Conversion of preferred stock to common stock															$ 5	$ (49)	$ 0	44	0	0	0
Award of restricted stock units (in shares)															28	0	0
Award of restricted stock units															$ 0	$ 0	$ 0	0	0	0	0
Other comprehensive income (loss)															0	0	0	0	0	962	962
Net loss															$ 0	$ 0	$ 0	0	(13,840)	0	(13,840)
Exercise of warrants (in shares)															4,913	0	0
Exercise of warrants															$ 5	$ 0	$ 0	3,335	0	0	3,340
Balance (in shares) at Jun. 30, 2020															56,903	0	0
Balance at Jun. 30, 2020															$ 57	$ 0	$ 0	754,818	(694,038)	(1,280)	59,557
Stock-based compensation															$ 0	$ 0	$ 0	1,944	0	0	1,944
Issuance of stock (in shares)															42,857	0	0
Issuance of stock															$ 43	$ 0	$ 0	13,606	0	0	13,649
Award of restricted stock units (in shares)															119	0	0
Award of restricted stock units															$ 0	$ 0	$ 0	0	0	0	0
Other comprehensive income (loss)															0	0	0	0	0	2,101	2,101
Net loss															$ 0	$ 0	$ 0	0	(15,082)	0	(15,082)
Balance (in shares) at Sep. 30, 2020															99,879	0	0
Balance at Sep. 30, 2020															$ 100	$ 0	$ 0	$ 770,368	$ (709,120)	$ 821	$ 62,169