Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents	$ 117,185	$ 37,900
Accounts receivable, net	14,867	9,119
Inventories	11,520	7,691
Prepaid expenses and other current assets	2,451	1,158
Total current assets	146,023	55,868
Property and equipment, net	10,966	8,696
Other Assets
Restricted cash	600	4,438
Intangible assets, net	995	1,243
Goodwill	753	753
Other long-term assets	32	280
Total assets	159,369	71,278
Current liabilities
Accounts payable	4,718	3,618
Accrued expenses	7,811	6,942
Deferred revenue	305	0
Current portion of long-term debt	295	272
Total current liabilities	13,129	10,832
Other long-term liabilities	220	271
Deferred revenue	4,625	0
Long-term debt	183	10,348
Total liabilities	18,157	21,451
Commitments and contingencies	0	0
Stockholders' equity
Convertible preferred stock, $0.00001 par value:	0	0
Preferred stock, $0.00001 par value:	0	0
Common stock, $0.00001 par value:	0	0
Additional paid-in capital	467,075	318,420
Accumulated deficit	(325,342)	(268,096)
Accumulated other comprehensive loss	(521)	(497)
Total stockholders’ equity	141,212	49,827
Total liabilities and stockholders’ equity	$ 159,369	$ 71,278