Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 24,356	$ 26,136
Short-term investments	69,641	51,419
Accounts receivable, net	17,279	19,564
Inventory, net	13,173	20,057
Prepaid expenses and other current assets	7,258	4,745
Total current assets	131,707	121,921
Restricted cash	0	143
Property and equipment, net	15,171	14,057
Other assets	680	641
Total assets	147,558	136,762
Current liabilities:
Accounts payable	8,636	4,092
Accrued liabilities	3,705	4,507
Employee-related Liabilities, Current	12,060	8,634
Customer Deposits	8,167	8,945
Deferred revenue, current portion	9,890	9,229
Deferred rent, current portion	657	512
Total current liabilities	43,115	35,919
Deferred revenue, net of current portion	1,620	3,304
Deferred rent and other liabilities, net of current portion	7,558	8,499
Long-term debt, net of discounts	58,396	48,931
Total liabilities	110,689	96,653
Commitments and contingencies (Note 14)
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; 30,913 and 25,421 shares issued and outstanding at December 31, 2018 and 2017, respectively	3	2
Additional paid-in-capital	428,162	353,308
Other comprehensive loss	(40)	(99)
Accumulated deficit	(391,256)	(313,102)
Total stockholders’ equity	36,869	40,109
Total liabilities and stockholders’ equity	$ 147,558	$ 136,762