Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows provided by operating activities:
Net income	$ 1,720	$ 3,106
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property and equipment	772	364
Amortization of intangibles	18	55
Stock-based compensation	4,245	4,058
Allowance for doubtful accounts	(6)	3
Loss on disposal of equipment	10	19
Changes in operating assets and liabilities:
Accounts and other receivables	1,524	(2,397)
Deferred income taxes	10,417	1,539
Prepaid income taxes	(7,495)	0
Prepaid expenses and other current assets	(2,177)	(395)
Other operating assets	(24)	(20)
Accounts payable	870	337
Accrued compensation and other current liabilities	1,072	(3,209)
Income taxes payable	97	35
Deferred revenue	1,041	(336)
Other long-term liabilities	240	(77)
Net cash provided by operating activities	12,324	3,082
Cash flows provided by investing activities:
Purchases of short-term investments	(28,972)	(37,960)
Proceeds from maturities of short-term investments	38,000	42,000
Purchases of property and equipment	(4,383)	(734)
Net cash provided by investing activities	4,645	3,306
Cash flows provided by (used in) financing activities:
Issuance of common stock under employee stock purchase plan	367	381
Exercise of stock options	1,451	1,229
Purchases of treasury stock	0	(11,995)
Net cash provided by (used in) financing activities	1,818	(10,385)
Net increase (decrease) in cash and cash equivalents	18,787	(3,997)
Cash and cash equivalents:
Beginning of period	14,380	14,136
End of period	33,167	10,139
Supplemental disclosure of cash flow information
Cash paid for taxes	136	46
Supplemental disclosure of noncash operating, investing, and financing activities
Amounts accrued for property and equipment	30	8
Release of Restricted Stock Units and Awards under company stock plan	$ 2,771	$ 3,745