Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 29,033	$ 24,356
Short-term investments		69,641
Short-term investments	127,822
Accounts receivable, net	27,153	17,279
Inventory, net	19,781	13,173
Prepaid expenses and other current assets	8,818	7,258
Total current assets	212,607	131,707
Property and equipment, net	20,184	15,171
Operating lease right-of-use assets	24,648	0
Other assets	2,315	680
Total assets	259,754	147,558
Current liabilities:
Accounts payable	10,282	8,636
Accrued liabilities	4,973	3,705
Accrued compensation and other employee benefits	15,579	12,060
Customer deposits	6,389	8,167
Deferred revenue, current portion	3,997	9,890
Deferred rent, current portion	0	657
Operating lease liabilities, current portion	3,766	0
Total current liabilities	44,986	43,115
Deferred revenue, net of current portion	976	1,620
Deferred rent and other liabilities, net of current portion	322	7,558
Long-term debt, net of discounts	79,951	58,396
Operating lease liabilities, net of current portion	29,368	0
Total liabilities	155,603	110,689
Commitments and contingencies (Note 16)
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; 36,298 and 30,913 shares issued and outstanding at December 31, 2019 and 2018, respectively	4	3
Additional paid-in-capital	535,954	428,162
Other comprehensive income (loss)	145	(40)
Accumulated deficit	(431,952)	(391,256)
Total stockholders’ equity	104,151	36,869
Total liabilities and stockholders’ equity	$ 259,754	$ 147,558