Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 168,443	$ 29,033
Short-term investments	80,266	127,822
Short-term investments		127,822
Accounts receivable, net	22,016	27,153
Inventory, net	25,988	19,781
Prepaid expenses and other	3,198	8,818
Total current assets	299,911	212,607
Property and equipment, net	20,837	20,184
Operating lease right-of-use assets	23,511	24,648
Other assets	2,243	2,315
Total assets	346,502	259,754
Current liabilities:
Accounts payable	5,205	10,282
Accrued liabilities	5,012	4,973
Accrued compensation and other employee benefits	12,546	15,579
Customer deposits	3,289	6,389
Deferred revenue, current portion	5,008	3,997
Operating lease liabilities, current portion	4,319	3,766
Total current liabilities	35,379	44,986
Deferred revenue, net of current portion	1,040	976
Other long-term liabilities	0	322
Long-term debt, net	167,308	79,951
Operating lease liabilities, net of current portion	28,087	29,368
Total liabilities	231,814	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; 37,937 and 36,298 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively	4	4
Additional paid-in capital	611,955	535,954
Accumulated other comprehensive income	438	145
Accumulated deficit	(497,709)	(431,952)
Total stockholders’ equity	114,688	104,151
Total liabilities and stockholders’ equity	$ 346,502	$ 259,754