Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 53,418	$ 71,404
Accounts receivable	40,939	19,967
Receivable due from Roche	11,402	10,159
Inventory	25,815	13,171
Prepaid expenses and other current assets	5,641	9,118
Total current assets	137,215	123,819
Property and equipment, net	50,778	41,119
Restricted cash	2,305	2,305
Other assets	3,142	1,760
Total assets	193,440	169,003
Current liabilities:
Accounts payable	28,834	21,926
Accrued expenses and other current liabilities	32,256	36,745
Deferred revenue	10,720	2,212
Roche related-party deferred revenue	8,190	3,742
Current portion of deferred rent	1,854	1,818
Total current liabilities	81,854	66,443
Deferred rent, net of current portion and other non-current liabilities	10,122	10,892
Indebtedness to Roche - non-current	110,000	60,000
Commitments and contingencies (Note 15)
Stockholders’ (deficit) equity:
Common stock, $0.0001 par value, 150,000,000 shares authorized; 37,147,273 and 36,541,770 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively	4	4
Additional paid-in capital	550,511	537,904
Accumulated other comprehensive (loss) income	(200)	109
Accumulated deficit	(558,851)	(506,349)
Total stockholders’ (deficit) equity	(8,536)	31,668
Total liabilities and stockholders’ (deficit) equity	$ 193,440	$ 169,003