Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 155,592	$ 29,033
Short-term investments	112,762	127,822
Short-term investments		127,822
Accounts receivable, net	21,217	27,153
Inventory, net	22,219	19,781
Prepaid expenses and other	5,419	8,818
Total current assets	317,209	212,607
Property and equipment, net	21,400	20,184
Operating lease right-of-use assets	24,043	24,648
Other assets	2,223	2,315
Total assets	364,875	259,754
Current liabilities:
Accounts payable	8,236	10,282
Accrued liabilities	4,543	4,973
Accrued compensation and other employee benefits	9,670	15,579
Customer deposits	4,084	6,389
Deferred revenue, current portion	5,038	3,997
Operating lease liabilities, current portion	3,877	3,766
Total current liabilities	35,448	44,986
Deferred revenue, net of current portion	1,049	976
Other long-term liabilities	0	322
Long-term debt, net	164,704	79,951
Operating lease liabilities, net of current portion	28,540	29,368
Total liabilities	229,741	155,603
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; 37,703 and 36,298 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively	4	4
Additional paid-in capital	605,622	535,954
Accumulated other comprehensive income	84	145
Accumulated deficit	(470,576)	(431,952)
Total stockholders’ equity	135,134	104,151
Total liabilities and stockholders’ equity	$ 364,875	$ 259,754