CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 94,553	$ 104,613
Short-term investments	1,897	1,000
Accounts receivable, net of allowance for doubtful accounts of $391 and $425 at September 30, 2019 and December 31, 2018, respectively	44,564	60,994
Deferred commissions - current	9,038	8,265
Prepaid expenses and other current assets	13,680	8,367
TOTAL CURRENT ASSETS	163,732	183,239
Property and equipment-net	5,529	7,046
Operating lease right-of-use asset	13,169
Deferred commissions - noncurrent	8,072	9,066
Goodwill	5,475	5,475
Other assets	5,954	5,561
TOTAL ASSETS	201,931	210,387
Current liabilities:
Accounts payable	2,775	2,154
Accrued expenses	20,452	27,347
Lease liabilities - current	5,820
Unearned revenue - current	76,913	74,177
Customer arrangements with termination rights	16,246	19,367
TOTAL CURRENT LIABILITIES	122,206	123,045
Long-term liabilities:
Lease liabilities - noncurrent	9,873
Unearned revenue - noncurrent	29,889	31,660
Other long-term liabilities	181	1,565
TOTAL LIABILITIES	162,149	156,270
Commitments and contingencies (Note 11)
Stockholders’ equity:
Common stock, $0.0001 par value, 300,000,000 shares authorized, 114,424,591 shares issued and 112,030,673 shares outstanding and 107,028,433 shares issued and 106,206,545 shares outstanding at September 30, 2019 and December 31, 2018, respectively	11	11
Additional paid-in capital	497,185	462,004
Treasury stock	(12,455)	(3,831)
Accumulated deficit	(444,959)	(404,067)
TOTAL STOCKHOLDERS’ EQUITY	39,782	54,117
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 201,931	$ 210,387