Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 60,293	$ 71,404
Accounts receivable	32,222	19,967
Receivable due from Roche	9,099	10,159
Inventory	16,411	13,171
Prepaid expenses and other current assets	13,003	9,118
Total current assets	131,028	123,819
Property and equipment, net	41,607	41,119
Restricted cash	2,305	2,305
Other assets	2,225	1,760
Total assets	177,165	169,003
Current liabilities:
Accounts payable	25,865	21,926
Accrued expenses and other current liabilities	22,393	36,745
Deferred revenue	2,867	2,212
Roche related-party deferred revenue	4,801	3,742
Current portion of deferred rent	1,836	1,818
Total current liabilities	57,762	66,443
Deferred rent, net of current portion and other non-current liabilities	10,507	10,892
Indebtedness to Roche - non-current	90,000	60,000
Commitments and contingencies (Note 15)
Stockholders’ equity:
Common stock, $0.0001 par value, 150,000,000 shares authorized; 36,933,569 and 36,541,770 shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively	4	4
Additional paid-in capital	544,541	537,904
Accumulated other comprehensive income (loss)	(177)	109
Accumulated deficit	(525,472)	(506,349)
Total stockholders’ equity	18,896	31,668
Total liabilities and stockholders’ equity	$ 177,165	$ 169,003