Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash	$ 123,984	$ 36,823
Accounts receivable, net of allowance for doubtful accounts of $652 and $276 at September 30, 2015 and December 31, 2014, respectively	31,969	25,412
Prepaid expenses and other current assets	4,165	4,209
Total current assets	160,118	66,444
Property and equipment, net	7,356	7,922
Goodwill	15,847	11,265
Intangible assets, net	2,482	1,156
Other assets	735	179
Total assets	186,538	86,966
Current liabilities:
Accounts payable	2,868	3,536
Accrued expenses	15,725	11,907
Deferred revenue, current portion	74,347	58,164
Other current liabilities	1,030	642
Total current liabilities	93,970	74,249
Deferred revenue, non-current portion	35,805	26,892
Term loan payable, net of unamortized debt discount		16,871
Other long-term liabilities	4,305	4,218
Total liabilities	$ 134,080	$ 122,230
Commitments and contingencies (note 9):
Stockholders' equity (deficit):
Preferred stock, $0.01 par value per share; 10,000,000 and 0 shares authorized at September 30, 2015 and December 31, 2014, respectively; 0 shares issued and outstanding at September 30, 2015 and December 31, 2014
Common stock, $0.01 par value per share; 100,000,000 and 35,700,000 shares authorized at September 30, 2015 and December 31, 2014, respectively; 39,393,903 and 12,563,095 shares issued and outstanding at September 30, 2015 and December 31, 2014, respectively	$ 394	$ 126
Additional paid-in-capital	374,822
Accumulated deficit	(319,232)	(243,462)
Treasury stock, at cost, 401,626 shares at September 30, 2015 and December 31, 2014	(3,526)	(3,526)
Total stockholders' equity (deficit)	52,458	(246,862)
Total liabilities, redeemable convertible preferred stock and stockholders' equity (deficit)	$ 186,538	86,966
Series A Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock:
Temporary equity, carrying amount		68,892
Series B Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock:
Temporary equity, carrying amount		5,681
Series C Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock:
Temporary equity, carrying amount		80,286
Series D Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock:
Temporary equity, carrying amount		$ 56,739