Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 107,167	$ 411,848
Short-term investments	262,687	28,883
Accounts receivable, net	35,470	31,100
Inventory, net	31,095	22,959
Prepaid expenses and other	9,548	4,190
Total current assets	445,967	498,980
Property and equipment, net	21,158	20,828
Operating lease right-of-use assets	19,115	21,492
Other assets	7,144	2,895
Total assets	493,384	544,195
Current liabilities:
Accounts payable	11,932	5,313
Accrued liabilities	4,256	4,970
Accrued compensation and other employee benefits	15,951	15,262
Customer deposits	1,327	1,631
Deferred revenue, current portion	6,425	5,610
Operating lease liabilities, current portion	4,589	4,313
Total current liabilities	44,480	37,099
Deferred revenue, net of current portion	2,847	1,843
Long-term debt, net	224,785	172,703
Operating lease liabilities, net of current portion	22,153	25,602
Total liabilities	294,265	237,247
Commitment and contingencies (Note 11)
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; 45,639 and 44,441 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively	5	4
Additional paid-in capital	819,630	848,891
Accumulated other comprehensive income (loss)	(24)	83
Accumulated deficit	(620,492)	(542,030)
Total stockholders’ equity	199,119	306,948
Total liabilities and stockholders’ equity	$ 493,384	$ 544,195