CONSOLIDATED BALANCE SHEETS - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 87,691,000	$ 94,415,000
Accounts receivable, net of allowance for doubtful accounts of $472 and $412 at June 30, 2020 and December 31, 2019, respectively	50,002,000	58,815,000
Deferred commissions - current	8,593,000	9,825,000
Prepaid expenses and other current assets	14,600,000	11,965,000
TOTAL CURRENT ASSETS	160,886,000	175,020,000
Property and equipment-net	3,891,000	4,804,000
Operating lease right-of-use assets	11,456,000	13,683,000
Deferred commissions - noncurrent	8,143,000	8,077,000
Intangible assets subject to amortization	3,000,000	0
Goodwill	8,407,000	5,475,000
Other assets	4,483,000	5,371,000
TOTAL ASSETS	200,266,000	212,430,000
Current liabilities:
Accounts payable	2,164,000	1,310,000
Accrued expenses	24,709,000	24,792,000
Lease liabilities - current	4,848,000	5,664,000
Unearned revenue - current	83,862,000	85,153,000
Customer arrangements with termination rights	12,057,000	16,130,000
TOTAL CURRENT LIABILITIES	127,640,000	133,049,000
Long-term liabilities:
Lease liabilities - noncurrent	7,665,000	10,088,000
Unearned revenue - noncurrent	29,351,000	33,058,000
Other long-term liabilities	122,000	237,000
TOTAL LIABILITIES	164,778,000	176,432,000
Commitments and contingencies (Note 12)
Stockholders' equity:
Common stock, $0.0001 par value, 300,000,000 shares authorized, 118,540,139 shares issued and 115,369,759 shares outstanding and 115,685,153 shares issued and 112,725,391 shares outstanding at March 31, 2020 and December 31, 2019, respectively	12,000	11,000
Additional paid-in capital	525,383,000	504,041,000
Treasury stock	(15,825,000)	(15,141,000)
Accumulated deficit	(474,082,000)	(452,913,000)
TOTAL STOCKHOLDERS' EQUITY	35,488,000	35,998,000
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 200,266,000	$ 212,430,000