CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (34,937)	$ (43,068)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	5,268	3,089
Stock-based compensation	28,701	20,692
Other	606	(1,022)
Changes in operating assets and liabilities:
Accounts receivable	13,512	(658)
Prepaid expenses and other current assets	1,058	1,673
Deferred commissions	497	(2,432)
Other assets	(13,177)	1,209
Accounts payable and accrued expenses	(3,023)	5,646
Accrued compensation	(5,274)	(3,092)
Deferred revenue	2,182	17,430
Other current and noncurrent liabilities	(276)	(46)
Net cash provided by (used in) operating activities	21,491	(2,997)
Cash flows from investing activities:
Purchases of property and equipment	(11,004)	(5,335)
Purchases of short-term investments	(91,908)	(102,453)
Sales and maturities of short-term investments	124,675	110,750
Net cash provided by investing activities	21,763	2,962
Cash flows from financing activities:
Proceeds from loan agreement	2,000	0
Principal payments under finance lease obligations	(8)	(8)
Proceeds from stock issued in connection with the employee stock purchase plan	7,307	8,579
Proceeds from the exercise of stock options	10,974	12,727
Net cash provided by financing activities	20,273	21,298
Effect of exchange rate changes on cash and cash equivalents and restricted cash	(1,463)	(716)
Net increase in cash and cash equivalents and restricted cash	62,064	20,547
Cash and cash equivalents and restricted cash at beginning of period	74,665	165,378
Cash and cash equivalents and restricted cash at end of period	136,729	185,925
Supplemental disclosure of cash flow information:
Cash paid for interest	16	49
Cash paid for income taxes	2,728	1,111
Supplemental cash flow information related to leases:
Operating cash payments for operating leases	2,595	2,286
Supplemental disclosure of non-cash flow investing activities:
Construction in progress	$ 1,199	$ 611