Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 84,109	$ 24,356
Short-term investments	58,288	69,641
Accounts receivable, net	18,081	17,279
Inventory, net	12,971	13,173
Prepaid expenses and other	8,642	7,258
Total current assets	182,091	131,707
Property and equipment, net	14,405	15,171
Operating lease right-of-use assets	23,605	0
Other assets	642	680
Total assets	220,743	147,558
Current liabilities:
Accounts payable	6,750	8,636
Accrued liabilities	4,840	3,705
Accrued compensation and other employee benefits	7,289	12,060
Customer deposits	5,941	8,167
Deferred revenue, current portion	9,476	9,890
Deferred rent, current portion	0	657
Operating lease liabilities, current portion	3,413	0
Total current liabilities	37,709	43,115
Deferred revenue, net of current portion	1,201	1,620
Deferred rent and other long-term liabilities	109	7,558
Long-term debt, net of discounts	58,930	58,396
Operating lease liabilities, net of current portion	28,194	0
Total liabilities	126,143	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; 35,044 and 30,913 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	3	3
Additional paid-in capital	507,730	428,162
Accumulated other comprehensive income (loss)	21	(40)
Accumulated deficit	(413,154)	(391,256)
Total stockholders’ equity	94,600	36,869
Total liabilities and stockholders’ equity	$ 220,743	$ 147,558