CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income (loss)	$ (20,044)	$ 54,343	$ (45,291)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization	2,197	855	968
Stock-based compensation	5,464	8,686	6,102
Impairment of right-of-use lease asset	939
Foreign currency translation loss	102	0	0
Deferred income taxes	431	109	(32)
Other	(3)	26	1
Changes in operating assets and liabilities:
Accounts and other receivables	(2,334)	(245)	576
Prepaid expenses and other current assets	(4,374)	(4,015)	141
Other assets	(11,379)	(7,188)	(197)
Accounts payable	(2,815)	(3,035)	696
Accrued compensation	(1,104)	(185)	(620)
Other current liabilities	(728)	(702)	(491)
Deferred revenue	(4,150)	21,406	(5,575)
Other long-term liabilities	3,699	(131)	(107)
Net cash (used in) provided by operating activities	(34,099)	69,924	(43,829)
Cash flows provided by (used in) investing activities:
Purchases of short-term investments	(8,930)	(17,693)	(23,807)
Proceeds from maturities of short-term investments	20,000	26,004	35,000
Purchases of property and equipment	(150)	(74)	(125)
Net cash provided by investing activities	10,920	8,237	11,068
Cash flows provided by (used in) financing activities:
Proceeds from issuance of common stock under employee stock purchase plan	165	218	328
Proceeds from stock options exercise	1,245	7,987	518
Cash paid for purchases of treasury stock	(2,741)	0	(328)
Net cash (used in) provided by financing activities	(1,331)	8,205	518
Net (decrease) increase in cash and cash equivalents	(24,510)	86,366	(32,243)
Cash and cash equivalents:
Beginning of year	110,988	24,622	56,865
End of year	86,478	110,988	24,622
Supplemental disclosure of cash flow information:
Cash paid for taxes	160	151	191
Supplemental disclosure of non-cash operating, investing, and financing activities:
Cashless option exercise under company stock plan	0	1,478	0
Release of Restricted Stock Units and Awards under company stock plan	$ 7,190	$ 2,806	$ 2,661

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration