Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 23,442	$ 24,356
Short-term investments	105,423	69,641
Accounts receivable, net	19,542	17,279
Inventory, net	19,040	13,173
Prepaid expenses and other	10,877	7,258
Total current assets	178,324	131,707
Property and equipment, net	14,863	15,171
Operating lease right-of-use assets	25,344	0
Other assets	2,228	680
Total assets	220,759	147,558
Current liabilities:
Accounts payable	6,724	8,636
Accrued liabilities	5,632	3,705
Accrued compensation and other employee benefits	10,774	12,060
Customer deposits	6,462	8,167
Deferred revenue, current portion	4,389	9,890
Deferred rent, current portion	0	657
Operating lease liabilities, current portion	3,690	0
Total current liabilities	37,671	43,115
Deferred revenue, net of current portion	876	1,620
Deferred rent and other long-term liabilities, net of current portion	246	7,558
Long-term debt, net of discounts	79,194	58,396
Operating lease liabilities, net of current portion	30,183	0
Total liabilities	148,170	110,689
Commitment and contingencies (Note 12)
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; 35,736 and 30,913 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	4	3
Additional paid-in capital	528,307	428,162
Accumulated other comprehensive income (loss)	217	(40)
Accumulated deficit	(455,939)	(391,256)
Total stockholders’ equity	72,589	36,869
Total liabilities and stockholders’ equity	$ 220,759	$ 147,558