CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (55,270)	$ (33,382)	$ (16,858)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	3,326	1,263	364
Amortization of intangible assets	2,585	592	12
Loss on disposal of property and equipment	0	3	7
Change in fair value of contingent consideration	843	(1,200)	0
Provision for doubtful accounts	854	476	(41)
Stock-based compensation expense	32,632	6,332	2,118
Deferred income taxes	(1,396)	0	0
Changes in operating assets and liabilities, net of impact of acquisitions:
Accounts receivable, net	(23,769)	(9,174)	(5,391)
Inventories	(20,049)	(5,963)	(1,465)
Deferred costs and other	(8,611)	(4,475)	(3,994)
Prepaid expenses and other assets	(4,476)	(1,911)	(617)
Accounts payable	1,986	2,562	2,488
Accrued expenses and other liabilities	8,011	8,286	2,650
Deferred revenue	1,142	595	1,042
Advance payments from partner	2,796	2,956	3,769
Net cash used in operating activities	(59,396)	(33,040)	(15,916)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(1,995)	(954)	(416)
Capitalized internal-use software costs	(5,199)	(3,562)	(1,461)
Purchase of short-term investments	(150,000)	0	0
Acquisitions, net of cash acquired	(27,435)	(12,268)	(598)
Change in escrow deposit	1,750	(7,000)	0
Net cash used in investing activities	(182,879)	(23,784)	(2,475)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of common stock upon initial public offering, net of issuance costs	377,787	0	0
Proceeds from exercise of stock options, net of repurchases	3,096	1,658	1,069
Proceeds from exercise of common stock warrants	60	0	286
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs	0	104,750	52,346
Payment of deferred purchase consideration	0	(2,000)	0
Payments of contingent consideration	(3,732)	0	0
Taxes paid related to net share settlement of equity awards	(1,035)	0	0
Repayments on long-term debt	0	0	(4,306)
Net cash provided by financing activities	376,176	104,408	49,395
Net increase in cash, cash equivalents, and restricted cash	133,901	47,584	31,004
Cash, cash equivalents, and restricted cash, beginning of period	109,107	61,523	30,519
Cash, cash equivalents, and restricted cash, end of period	243,008	109,107	61,523
Reconciliation of cash, cash equivalents, and restricted cash:
Cash and cash equivalents	241,738	108,928	61,243
Restricted cash	1,270	179	280
Supplemental disclosures of cash flow information
Cash paid for interest	0	0	66
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Accretion of redeemable convertible preferred stock	96	162	143
Conversion of redeemable convertible preferred stock to common stock	237,025	0	0
Purchases of property and equipment included in accounts payable and accrued expenses and other liabilities	160	20	37
Unpaid initial public offering issuance costs	286	0	0
Capitalized internal-use software costs in accounts payable and accrued expenses and other liabilities	11	299	149
Retrofit
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Contingent consideration liability related to acquisition	0	6,204	0
myStrength
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Contingent consideration liability related to acquisition	3,300	$ 0	$ 0
Common Stock
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Conversion of redeemable convertible preferred stock to common stock	$ 59