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Liquidity and Capital Resources (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Liquidity and Capital Resources [Abstract]
Accumulated Deficit	$ (353,558)			$ (337,406)
Stockholders' equity	18,203	$ 16,212	$ 26,178	$ 34,170	$ 21,774	$ 20,320
Cash, cash equivalents and investments available-for-sale	41,000
Working capital	18,400
Net cash used in operating activities	$ (17,433)	$ (16,154)

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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