Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 396,502	$ 411,848
Short-term investments	13,416
Short-term investments		28,883
Accounts receivable, net	33,183	31,100
Inventory, net	24,434	22,959
Prepaid expenses and other	6,910	4,190
Total current assets	474,445	498,980
Property and equipment, net	21,730	20,828
Operating lease right-of-use assets	20,703	21,492
Other assets	3,680	2,895
Total assets	520,558	544,195
Current liabilities:
Accounts payable	5,811	5,313
Accrued liabilities	3,913	4,970
Accrued compensation and other employee benefits	11,476	15,262
Customer deposits	1,332	1,631
Deferred revenue, current portion	6,714	5,610
Operating lease liabilities, current portion	4,393	4,313
Total current liabilities	33,639	37,099
Deferred revenue, net of current portion	1,984	1,843
Long-term debt, net	224,070	172,703
Operating lease liabilities, net of current portion	24,473	25,602
Total liabilities	284,166	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; 45,205 and 44,441 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively	5	4
Additional paid-in capital	798,589	848,891
Accumulated other comprehensive income	9	83
Accumulated deficit	(562,211)	(542,030)
Total stockholders’ equity	236,392	306,948
Total liabilities and stockholders’ equity	$ 520,558	$ 544,195