Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income (loss)	$ 5,997	$ (26,065)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Stock-based compensation	8,507	8,057
Depreciation and amortization	1,014	1,056
Amortization of contract acquisition costs	1,430	2,017
Amortization of debt issuance costs	492	0
Impairment of capitalized cloud computing costs	182	805
Change in deferred tax asset	54	(77)
Provision for credit losses	101	1,750
Gain on sale of property and equipment	(45)	0
PPP loan forgiveness	(7,185)	0
Change in right-of-use assets	1,681	250
Other	0	327
Changes in assets and liabilities:
Accounts receivable	(8,899)	2,209
Inventories	(6,926)	4,588
Other current assets and prepaid expenses	(4,571)	(1,273)
Other long-term assets	(3,487)	(1,701)
Accounts payable	575	(5,886)
Accrued liabilities	11,782	(5,061)
Operating lease liabilities	(1,573)	0
Deferred revenue	(557)	(2,398)
Net cash provided by (used in) operating activities	(1,428)	(21,402)
Cash flows from investing activities:
Acquisition of property, equipment, and software	(382)	(774)
Proceeds from disposal of property and equipment	71	0
Proceeds from maturities of marketable investments	0	19,000
Purchase of marketable investments	0	(24,411)
Net cash used in investing activities	(311)	(6,185)
Cash flows from financing activities:
Proceeds from exercise of stock options and employee stock purchase plan	2,056	856
Purchase of capped call	(16,134)	0
Proceeds from PPP loan	0	7,167
Proceeds from issuance of Convertible notes	138,250	0
Payment of issuance costs of Convertible notes	(4,717)	0
Proceeds from equity offering	0	28,798
Cost of equity offering	0	(2,303)
Taxes paid related to net share settlement of equity awards	(1,963)	(3,340)
Payments on finance lease obligations	(314)	(513)
Net cash provided by financing activities	117,178	30,665
Net increase in cash and cash equivalents	115,439	3,078
Cash and cash equivalents at beginning of period	47,047	26,316
Cash and cash equivalents at end of period	162,486	29,394
Supplemental disclosure of non-cash items:
Assets acquired under finance lease	271	27
Assets acquired under operating lease	123	10,623
Gain on extinguishment of PPP loan	7,185	0
Supplemental disclosure of cash flow information:
Income tax paid	$ 763	$ 0