Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows provided by operating activities:
Net income	$ 1,536	$ 2,033
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property and equipment	549	234
Amortization of intangibles	15	40
Stock-based compensation	2,969	2,927
Allowance for doubtful accounts	3	14
Loss on disposal of equipment	10	19
Changes in operating assets and liabilities:
Accounts and other receivables	1,918	(764)
Deferred income taxes	4,766	1,035
Prepaid expenses and other current assets	(1,289)	(404)
Other operating assets	(3,740)	(37)
Accounts payable	573	676
Accrued compensation and other current liabilities	1,277	(2,153)
Deferred revenue	7,895	6,121
Other long-term liabilities	192	(52)
Net cash provided by operating activities	16,674	9,689
Cash flows provided by (used in) investing activities:
Purchases of short-term investments	(4,994)	(28,969)
Proceeds from maturities of short-term investments	29,000	29,000
Purchases of property and equipment	(3,289)	(666)
Net cash provided by (used in) investing activities	20,717	(635)
Cash flows provided by (used in) financing activities:
Issuance of common stock under employee stock purchase plan	190	176
Exercise of stock options	675	842
Purchases of treasury stock	0	(6,991)
Net cash provided by (used in) financing activities	865	(5,973)
Net increase in cash and cash equivalents	38,256	3,081
Cash and cash equivalents:
Beginning of period	14,380	14,136
End of period	52,636	17,217
Supplemental disclosure of cash flow information
Cash paid for taxes	90	25
Supplemental disclosure of noncash operating, investing, and financing activities
Amounts accrued for property and equipment	1,052	30
Release of Restricted Stock Units and Awards under company stock plan	$ 2,647	$ 3,588