Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash	$ 27,000	$ 36,823
Accounts receivable, net of allowance for doubtful accounts of $580 and $276 at June 30, 2015 and December 31, 2014, respectively	26,363	25,412
Prepaid expenses and other current assets	6,297	4,209
Total current assets	59,660	66,444
Property and equipment, net	7,607	7,922
Goodwill	15,758	11,265
Intangible assets, net	2,767	1,156
Other assets	682	179
Total assets	86,474	86,966
Current liabilities:
Accounts payable	2,990	3,536
Accrued expenses	12,765	11,907
Deferred revenue, current portion	66,040	58,164
Term loan payable, net of unamortized debt discount	3,976
Other current liabilities	991	642
Total current liabilities	86,762	74,249
Deferred revenue, non-current portion	31,471	26,892
Term loan payable, net of unamortized debt discount	13,172	16,871
Other long-term liabilities	5,050	4,218
Total liabilities	$ 136,455	$ 122,230
Commitments and contingencies (note 7):
Stockholders' deficit:
Common stock, $0.01 par value per share; 35,700,000 shares authorized at June 30, 2015 and December 31, 2014; 100,000,000 shares authorized pro forma; 13,194,806 and 12,563,095 shares issued and outstanding at June 30, 2015 and December 31, 2014, respectively; 39,247,411 shares issued and outstanding, pro forma	$ 132	$ 126
Accumulated deficit	(293,246)	(243,462)
Treasury stock, at cost, 401,626 shares at June 30, 2015 and December 31, 2014	(3,526)	(3,526)
Total stockholders' deficit	(296,640)	(246,862)
Total liabilities, redeemable convertible preferred stock and stockholders' deficit	86,474	86,966
Pro Forma [Member]
Current assets:
Cash	140,921
Accounts receivable, net of allowance for doubtful accounts of $580 and $276 at June 30, 2015 and December 31, 2014, respectively	26,363
Prepaid expenses and other current assets	4,161
Total current assets	171,445
Property and equipment, net	7,607
Goodwill	15,758
Intangible assets, net	2,767
Other assets	682
Total assets	198,259
Current liabilities:
Accounts payable	2,990
Accrued expenses	12,155
Deferred revenue, current portion	66,040
Term loan payable, net of unamortized debt discount	3,976
Other current liabilities	991
Total current liabilities	86,152
Deferred revenue, non-current portion	31,471
Term loan payable, net of unamortized debt discount	13,172
Other long-term liabilities	5,050
Total liabilities	$ 135,845
Commitments and contingencies (note 7):
Stockholders' deficit:
Common stock, $0.01 par value per share; 35,700,000 shares authorized at June 30, 2015 and December 31, 2014; 100,000,000 shares authorized pro forma; 13,194,806 and 12,563,095 shares issued and outstanding at June 30, 2015 and December 31, 2014, respectively; 39,247,411 shares issued and outstanding, pro forma	$ 392
Additional paid-in-capital	372,955
Accumulated deficit	(307,407)
Treasury stock, at cost, 401,626 shares at June 30, 2015 and December 31, 2014	(3,526)
Total stockholders' deficit	62,414
Total liabilities, redeemable convertible preferred stock and stockholders' deficit	198,259
Series A Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock:
Temporary equity, carrying amount	83,200	68,892
Series B Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock:
Temporary equity, carrying amount	6,854	5,681
Series C Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock:
Temporary equity, carrying amount	91,215	80,286
Series D Redeemable Convertible Preferred Stock [Member]
Redeemable convertible preferred stock:
Temporary equity, carrying amount	$ 65,390	$ 56,739