Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 98,457	$ 107,068
Short-term investments	213,618	241,821
Accounts receivable, net	30,381	40,130
Inventory, net	34,590	31,486
Prepaid expenses and other	10,084	7,115
Total current assets	387,130	427,620
Property and equipment, net	32,704	27,043
Operating lease right-of-use assets	18,562	19,226
Other assets	6,324	5,592
Total assets	444,720	479,481
Current liabilities:
Accounts payable	18,426	14,283
Accrued liabilities	4,541	6,765
Accrued compensation and other employee benefits	12,188	17,466
Customer deposits	1,262	1,278
Deferred revenue, current portion	8,053	7,474
Operating lease liabilities, current portion	5,116	4,889
Total current liabilities	49,586	52,155
Deferred revenue, net of current portion	3,820	3,527
Long-term debt, net	225,511	225,144
Operating lease liabilities, net of current portion	20,498	21,693
Total liabilities	299,415	302,519
Commitment and contingencies (Note 10)
Stockholders’ equity:
Preferred stock, $0.0001 par value, 15,000 shares authorized; none issued	0	0
Common stock, $0.0001 par value, 150,000 shares authorized; 46,402 and 45,729 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively	5	5
Additional paid-in capital	835,845	827,028
Accumulated other comprehensive loss	(1,292)	(318)
Accumulated deficit	(689,253)	(649,753)
Total stockholders’ equity	145,305	176,962
Total liabilities and stockholders’ equity	$ 444,720	$ 479,481