CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows provided by operating activities:
Net loss	$ (2,695)	$ (59)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization of property and equipment	224	314
Amortization of intangibles	3	12
Stock-based compensation	2,334	1,740
Allowance for doubtful accounts	0	8
Changes in operating assets and liabilities:
Accounts and other receivables	(3,561)	1,111
Deferred income taxes	(1,629)	(138)
Prepaid income taxes	725	0
Prepaid expenses and other current assets	111	248
Other operating assets	(16)	(10)
Accounts payable	2,328	887
Accrued compensation and other current liabilities	(2,270)	1,477
Deferred revenue	(1,148)	15,789
Other long-term liabilities	(262)	119
Net cash provided by (used in) operating activities	(5,856)	21,498
Cash flows provided by (used in) investing activities:
Purchases of short-term investments	(9,945)	(4,994)
Proceeds from maturities of short-term investments	10,000	10,000
Purchases of property and equipment	(65)	(783)
Net cash provided by (used in) investing activities	(10)	4,223
Cash flows provided by financing activities:
Issuance of common stock under employee stock purchase plan	128	190
Exercise of stock options	1,604	64
Net cash provided by financing activities	1,732	254
Net increase (decrease) in cash and cash equivalents	(4,134)	25,975
Cash and cash equivalents:
Beginning of period	25,013	14,380
End of period	20,879	40,355
Supplemental disclosure of cash flow information
Cash paid for taxes	(529)	70
Supplemental disclosure of noncash operating, investing, and financing activities
Amounts accrued for property and equipment	0	965
Release of Restricted Stock Units and Awards under company stock plan	$ 1,777	$ 2,184