Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 33,371	$ 24,356
Short-term investments	112,109	69,641
Accounts receivable, net	18,999	17,279
Inventory, net	16,470	13,173
Prepaid expenses and other	9,168	7,258
Total current assets	190,117	131,707
Property and equipment, net	14,713	15,171
Operating lease right-of-use assets	25,889	0
Other assets	2,181	680
Total assets	232,900	147,558
Current liabilities:
Accounts payable	6,132	8,636
Accrued liabilities	3,703	3,705
Accrued compensation and other employee benefits	9,749	12,060
Customer deposits	7,369	8,167
Deferred revenue, current portion	6,033	9,890
Deferred rent, current portion	0	657
Operating lease liabilities, current portion	3,517	0
Total current liabilities	36,503	43,115
Deferred revenue, net of current portion	853	1,620
Deferred rent and other long-term liabilities, net of current portion	170	7,558
Long-term debt, net of discounts	78,442	58,396
Operating lease liabilities, net of current portion	30,944	0
Total liabilities	146,912	110,689
Commitment and contingencies
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; 35,367 and 30,913 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively	4	3
Additional paid-in capital	518,971	428,162
Accumulated other comprehensive income (loss)	204	(40)
Accumulated deficit	(433,191)	(391,256)
Total stockholders’ equity	85,988	36,869
Total liabilities and stockholders’ equity	$ 232,900	$ 147,558