Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 72,654	$ 77,130
Accounts receivable, net of allowance for doubtful accounts of $148	7,236	5,516
Prepaid expenses and other current assets	2,289	2,631
Total current assets	82,179	85,277
Property and equipment, net	21,852	21,070
Restricted cash	530	530
Goodwill	52,848	52,848
Intangible assets, net	15,826	17,108
Other assets	1,140	1,217
Total assets	174,375	178,050
Current liabilities
Accounts payable	1,294	1,522
Accrued expenses	7,530	8,053
Deferred revenue, short-term	24,900	22,482
Notes and leases payable, short-term	873	842
Total current liabilities	34,597	32,899
Deferred revenue, long-term	2,934	3,349
Notes and leases payable, long-term	412	638
Other long-term liabilities	2,398	2,324
Total liabilities	40,341	39,210
Contingencies (Note 5)
Redeemable non‑controlling interest	370	355
Stockholders’ equity (deficit)
Preferred stock, $.001 par value; 10,000 authorized; 0 shares issued and outstanding	0	0
Common stock, $.001 par value; 90,000 shares authorized; 25,297 and 25,247 shares issued and 24,835 and 24,785 shares outstanding at March 31, 2014 and December 31, 2013, respectively	25	25
Additional paid in capital	331,510	329,073
Treasury stock, at cost; 462 shares	(5,831)	(5,831)
Accumulated other comprehensive loss	(42)	(49)
Accumulated deficit	(191,998)	(184,733)
Total stockholders’ equity (deficit)	133,664	138,485
Total liabilities, redeemable securities and stockholders’ equity (deficit)	$ 174,375	$ 178,050