CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows provided by (used in) operating activities:
Net income (loss)	$ 7,377	$ (5,540)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	389	1,446
Stock-based compensation	1,582	2,094
Deferred income taxes	280	3
Foreign currency remeasurement losses	32	252
Other	45	66
Changes in operating assets and liabilities:
Accounts and other receivables	(694)	1,596
Prepaid expenses and other current assets	667	5,306
Increase (Decrease) in Deposit Assets	(60)	(4,889)
Other assets	1,408	748
Accounts payable	(7)	(338)
Accrued compensation	640	(1,041)
Other current liabilities	610	(1,288)
Deferred revenue	(2,476)	(2,456)
Other long-term liabilities	(739)	(727)
Net cash provided by (used in) operating activities	9,054	(4,768)
Cash flows provided by (used in) investing activities:
Proceeds from maturities of short-term investments	0	3,000
Purchases of property and equipment	(88)	(30)
Net cash provided by (used in) investing activities	(88)	2,970
Cash flows provided by (used in) financing activities:
Proceeds from issuance of common stock, net	35,833	0
Cash paid for purchases of treasury shares	0	(30,642)
Proceeds from issuance of common stock under employee stock purchase plan	89	63
Proceeds from stock options exercises	2,864	0
Net cash provided by (used in) financing activities	38,786	(30,579)
Net increase (decrease) in cash and cash equivalents	47,752	(32,377)
Cash and cash equivalents:
Beginning of period	59,522	86,478
End of period	107,274	54,101
Supplemental disclosure of cash flow information:
Cash paid for income taxes	13	20
Supplemental disclosure of non-cash operating, investing, and financing activities:
Release of restricted stock units and awards under stock plan	4,016	2,554
Leased assets obtained in exchange for new operating lease liabilities	$ 0	$ 577