CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows provided by (used in) operating activities:
Net loss	$ (32,997)	$ (1,233)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization of property and equipment	709	677
Amortization of intangibles	0	6
Stock-based compensation	4,073	4,803
Deferred income taxes	(75)	(1,228)
Allowance for doubtful accounts	0	2
Loss on disposal of equipment	1	0
Income from discontinued operations	0	(649)
Changes in operating assets and liabilities:
Accounts and other receivables	(5,096)	(2,037)
Prepaid income taxes	0	493
Prepaid expenses and other current assets	(101)	(205)
Intangibles and other assets	(146)	(258)
Accounts payable	(1,116)	1,768
Accrued compensation and other current liabilities	(3,209)	(342)
Deferred revenue	(4,082)	25,899
Other long-term liabilities	(78)	(173)
Net cash provided by (used in) operating activities	(42,117)	27,523
Cash flows provided by investing activities:
Purchases of short-term investments	(23,807)	(25,360)
Proceeds from maturities of short-term investments	28,000	32,500
Purchases of property and equipment	(121)	(169)
Proceeds for discontinued operations	0	1,000
Net cash provided by investing activities	4,072	7,971
Cash flows provided by financing activities:
Issuance of common stock under employee stock purchase plan	328	307
Exercise of stock options	443	1,889
Purchases of treasury stock	(328)	(729)
Net cash provided by financing activities	443	1,467
Net increase (decrease) in cash and cash equivalents	(37,602)	36,961
Cash and cash equivalents:
Beginning of period	56,865	25,013
End of period	19,263	61,974
Supplemental disclosure of cash flow information
Cash paid (received) for taxes	128	(427)
Supplemental disclosure of noncash operating, investing, and financing activities
Amounts accrued for property and equipment	0	5
Release of Restricted Stock Units and Awards under company stock plan	$ 2,524	$ 1,945