Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net loss	$ (159,543,000)	$ (115,254,000)	$ (110,078,000)
Adjustments to reconcile net loss to net cash used in operating activities
Stock-based compensation expense	25,908,000	30,173,000	19,374,000
Depreciation and amortization	8,116,000	5,871,000	5,738,000
Operating cash flows from operating leases	4,089,000	3,450,000	3,238,000
Amortization of deferred financing costs	1,477,000	1,429,000	8,881,000
Amortization of premium and accretion of discount on short-term investments, net	1,706,000	(1,765,000)	(121,000)
Provision for inventory obsolescence and bad debt expense (recovery)	4,023,000	2,040,000	886,000
Payment of accrued interest on long-term debt	0	0	(2,593,000)
Gain (Loss) on Extinguishment of Debt	0	0	(7,143,000)
Loss on disposal of property and equipment and other assets	847,000	5,000	119,000
Loss on equity securities	0	0	300,000
Changes in operating assets and liabilities
Accounts receivable	7,414,000	(9,526,000)	(3,949,000)
Inventory	(15,271,000)	(10,520,000)	(4,909,000)
Prepaid expenses and other assets	(6,942,000)	(5,443,000)	4,321,000
Accounts payable	1,396,000	8,687,000	(3,170,000)
Accrued liabilities	(407,000)	(914,000)	(21,000)
Accrued compensation and other employee benefits	256,000	2,497,000	(936,000)
Contract With Customer, Liability, Increase (Decrease) In Customer Deposits	479,000	(353,000)	(4,758,000)
Deferred revenue and other liabilities	2,674,000	3,336,000	2,033,000
Operating lease liabilities	(4,828,000)	(4,262,000)	(3,160,000)
Net cash used in operating activities	(128,606,000)	(90,549,000)	(81,662,000)
Investing activities
Purchases of property and equipment	(14,364,000)	(6,348,000)	(7,457,000)
Purchase of internal-use software assets	(7,952,000)	(2,299,000)	0
Payments to Acquire Intangible Assets	(750,000)	0	0
Proceeds from sale of short-term investments	7,700,000	4,000,000	21,218,000
Proceeds from maturity of short-term investments	197,363,000	44,664,000	116,284,000
Purchases of short-term investments	(49,500,000)	(260,239,000)	(38,804,000)
Net cash provided by (used in) investing activities	132,497,000	(220,222,000)	91,241,000
Financing activities
Proceeds from issuance of 2025 convertible senior notes	0	0	230,000,000
Fees paid for issuance of 2025 convertible senior notes	0	0	7,403,000
Repayment of long-term debt	0	0	(80,000,000)
Fees paid upon extinguishment of debt	0	0	(4,845,000)
Proceeds from sale of common stock, net	0	0	215,765,000
Proceeds from issuance of common stock warrants	0	0	737,000
Proceeds from issuance of common stock for employee stock purchase plan	2,669,000	2,427,000	2,190,000
Tax withholdings related to net share settlements of restricted stock units	(1,504,000)	(2,585,000)	(2,012,000)
Proceeds from exercise of stock options	1,440,000	6,452,000	18,751,000
Repayment of finance lease obligations	(333,000)	(236,000)	(135,000)
Net cash provided by financing activities	2,272,000	6,058,000	373,048,000
Effect of exchange rate changes on cash, restricted cash and cash equivalents	(83,000)	(67,000)	188,000
Net increase (decrease) in cash, restricted cash and cash equivalents	6,080,000	(304,780,000)	382,815,000
Cash, restricted cash and cash equivalents
Beginning of year	107,068,000	411,848,000	29,033,000
End of year	113,148,000	107,068,000	411,848,000
Supplemental disclosures
Cash paid for interest	6,038,000	6,038,000	4,571,000
Cash paid for taxes	180,000	189,000	357,000
Instruments reclassified from inventory to property and equipment	665,000	525,000	854,000
Right-of-use assets obtained in exchange for finance lease liabilities	0	448,000	524,000
Right-of-use assets obtained in exchange for operating lease liabilities	$ 2,126,000	$ 929,000	$ 0