CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities:
Net loss	$ (10,926)	$ (9,329)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	2,094	383
Depreciation expense	409	297
Non-cash operating lease expense	494	269
Other non-cash items	44	54
Changes in operating assets and liabilities:
Accounts receivable	(1,292)	3,509
Prepaid expenses and other current assets	(361)	(3,711)
Other non-current assets	45	(192)
Accounts payable	2,644	(958)
Deferred revenues	3,020	(935)
Operating lease liabilities	(428)	(1,227)
Accrued expenses and other liabilities	(2,871)	(216)
Net cash used in operating activities	(7,128)	(12,056)
Investing activities:
Purchases of property and equipment	(199)	(400)
Net cash used in investing activities	(199)	(400)
Financing activities:
Payments related to finance leases	(36)	(1,395)
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs		37,274
Proceeds from issuance of common stock, net of issuance costs	8
Payments for deferred offering costs		(722)
Repayments of borrowings	(1,256)	0
Net cash provided by financing activities	(1,284)	35,157
Net increase (decrease) in cash, cash equivalents and restricted cash	(8,611)	22,701
Cash, cash equivalents and restricted cash at beginning of period	113,575	48,580
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(87)	(773)
Cash, cash equivalents and restricted cash at end of period	104,877	70,508
Supplemental disclosure of cash flow information:
Cash paid for interest	(2)
Cash paid for income taxes	0	0
Supplemental disclosure of non-cash investing activities:
Property and equipment additions in accounts payable and accrued expenses	$ (539)	$ (153)