Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Revision of Prior Period, Accounting Standards Update, Adjustment	Common Stock	Additional Paid In Capital	Accumulated Other Comprehensive Gain	Noncontrolling Interest	Accumulated Deficit	Accumulated Deficit Revision of Prior Period, Accounting Standards Update, Adjustment
Beginning Balance at Dec. 31, 2019	$ 571,039	$ 93	$ 12	$ 935,834	$ 671		$ (365,478)	$ 93
Beginning Balance, Shares at Dec. 31, 2019			125,238,142
Accounting Standards Update Extensible List	us-gaap:AccountingStandardsUpdate201602Member
Issuance of common stock for cash upon exercise of stock options	$ 4,517			4,517
Issuance of common stock for cash upon exercise of stock options, Shares			1,381,437
Vesting of restricted stock units			2,250
Common stock option and restricted stock unit share-based compensation	4,675			4,675
Other comprehensive income (loss)	2,642				2,642
Net loss	(31,403)						(31,403)
Ending Balance at Mar. 31, 2020	551,563		$ 12	945,026	3,313		(396,788)
Ending Balance, Shares at Mar. 31, 2020			126,621,829
Beginning Balance at Dec. 31, 2020	743,266		$ 14	1,253,971	893		(511,612)
Beginning Balance, Shares at Dec. 31, 2020			137,646,896
Issuance of common stock upon exercise of common stock warrants, Shares			54,162
Issuance of common stock for cash upon exercise of stock options	$ 14,442			14,442
Issuance of common stock for cash upon exercise of stock options, Shares	2,183,640		2,183,640
Common stock option and restricted stock unit share-based compensation	$ 8,484			8,484
Capital contributions for Spin Technologies, Inc.	429			300		$ 129
Other comprehensive income (loss)	(262)				(262)
Net loss	(40,642)						(40,642)
Ending Balance at Mar. 31, 2021	$ 725,717		$ 14	$ 1,277,197	$ 631	$ 129	$ (552,254)
Ending Balance, Shares at Mar. 31, 2021			139,884,698