CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net loss	$ (40,076)	$ (27,497)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	26,522	23,260
Stock-based compensation	21,021	23,692
Amortization of debt discount and issuance cost	8,203	7,776
Allowance for credit losses	542	583
Deferred income taxes	261	375
Change in fair value of contingent consideration	5,788	1,052
Impairment of capitalized software development costs	0	3,579
Other non-cash expenses	2,546	1,872
Changes in operating assets and liabilities:
Accounts receivable	2,615	(5,332)
Prepaid expenses and other current assets	158	(11,084)
Accounts payable and other current liabilities	4,893	9,053
Payments for contingent consideration and bonuses	(15,418)	0
Accrued compensation and benefits	(4,334)	(1,743)
Deferred revenues	450	4,405
Net cash provided by operating activities	13,171	29,991
Cash flows from investing activities:
Purchases of property and equipment	(6,648)	(7,412)
Purchase of intangible assets	(3,000)	(14,811)
Proceeds from maturities of short-term investment	0	20,738
Net cash used in investing activities	(9,648)	(1,485)
Cash flows from financing activities:
Proceeds from issuances of common stock under stock plans	1,579	3,113
Payments for taxes related to net share settlement of equity awards	(5,456)	(8,181)
Repurchases and retirement of common stock under share repurchase program	0	(87,097)
Principal payments on promissory note and capital lease obligations	(100)	(236)
Payments for contingent consideration	(14,582)	0
Net cash used in financing activities	(18,559)	(92,401)
Effect of exchange rates on cash and cash equivalents	126	1
Net decrease in cash and cash equivalents	(14,910)	(63,894)
Cash and cash equivalents at beginning of period	224,764	302,028
Cash and cash equivalents at end of period	209,854	238,134
Supplemental disclosures of cash flow information:
Cash paid for income taxes	149	240
Cash paid for interest	1,753	1,764
Supplemental disclosures of noncash investing and financing activities:
Fixed asset purchases not yet paid	924	599
Intangible asset acquisitions not yet paid	$ 2,250	$ 0