CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows provided by (used in) operating activities:
Net income (loss)	$ 2,036	$ (4,828)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	192	1,178
Stock-based compensation	531	729
Foreign Currency Remeasurement Gain (Loss)	280	361
Other	24	34
Changes in operating assets and liabilities:
Accounts and other receivables	184	(2,202)
Prepaid expenses and other current assets	1,396	4,820
Increase (Decrease) in Deposit Assets	0	(361)
Other assets	843	339
Accounts payable	305	122
Accrued compensation	(68)	(855)
Other current liabilities	280	422
Deferred revenue	(1,226)	(1,302)
Other long-term liabilities	(367)	227
Net cash provided by (used in) operating activities	4,410	(1,316)
Cash flows provided by (used in) investing activities:
Proceeds from maturities of short-term investments	0	3,000
Purchases of property and equipment	(57)	(21)
Net cash provided by (used in) investing activities	(57)	2,979
Cash flows provided by (used in) financing activities:
Proceeds from issuance of common stock, net	35,937	0
Cash paid for purchases of treasury shares	0	(11,975)
Proceeds from issuance of common stock under employee stock purchase plan	89	63
Proceeds from stock options exercises	2,723	0
Net cash provided by (used in) financing activities	38,749	(11,912)
Net increase (decrease) in cash and cash equivalents	43,102	(10,249)
Cash and cash equivalents:
Beginning of period	59,522	86,478
End of period	102,624	76,229
Supplemental disclosure of cash flow information:
Cash paid for income taxes	13	19
Supplemental disclosure of non-cash operating, investing, and financing activities:
Release of restricted stock units and awards under company stock plan	2,367	1,356
Leased assets obtained in exchange for new operating lease liabilities	$ 0	$ 577