CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net loss	$ (22,977)	$ (21,440)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	2,678	1,622
Stock-based compensation	13,035	9,319
Deferred income taxes	41	0
Other	474	(284)
Changes in operating assets and liabilities:
Accounts receivable	20,813	11,104
Prepaid expenses and other current assets	1,663	1,374
Deferred commissions	1,523	(377)
Other assets	2,155	54
Accounts payable and accrued expenses	3,669	3,372
Accrued compensation	(13,277)	(7,233)
Deferred revenue	(5,036)	2,002
Other current liabilities	(535)	(429)
Other liabilities	266	42
Net cash provided by (used in) operating activities	4,492	(874)
Cash flows from investing activities:
Purchases of property and equipment	(614)	(2,306)
Purchases of short-term investments	(58,831)	(53,915)
Sales and maturities of short-term investments	78,175	41,750
Net cash provided by (used in) investing activities	18,730	(14,471)
Cash flows from financing activities:
Principal payments under finance lease obligations	(4)	(4)
Proceeds from stock issued in connection with the employee stock purchase plan	7,307	8,579
Proceeds from the exercise of stock options	3,978	9,878
Net cash provided by financing activities	11,281	18,453
Effect of exchange rate changes on cash and cash equivalents and restricted cash	(1,097)	(258)
Net increase in cash and cash equivalents and restricted cash	33,406	2,850
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	108,071	168,228
Supplemental disclosure of cash flow information:
Cash paid for interest	41	24
Cash paid for income taxes	1,203	416
Supplemental cash flow information related to leases:
Operating cash payments for operating leases	1,263	1,195
Supplemental disclosure of non-cash flow investing and financing activities:
Construction in progress	$ 5,107	$ 186