CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	6 Months Ended		99 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011
Cash flows from operating activities:
Net loss	$ (2,175)	$ (11,054)	$ (170,468)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation and amortization	6	686	9,064
Amortization of lease incentive		(4)	(474)
Common stock issued for licenses			147
Stock-based compensation expense	579	3,549	20,393
Noncash license fee			54
Noncash interest expense related to debt and warrants	265	139	1,402
Noncash (income) expense related to change in fair value of warrant liability	15	(3,248)	(6,062)
Provisions on inventory			5,846
Gain (loss) on disposal of property and equipment		10	(7)
Impairment of long-lived assets			1,894
Changes in operating assets and liabilities:
Accounts receivable	93	468	(174)
Unbilled receivable	278	119	(176)
Inventory		(1,306)	(11,226)
Prepaid expenses and other current assets	75	(55)	(557)
Deferred revenue	392	1,515	7,619
Accounts payable	(207)	52	587
Accrued expenses and other current liabilities	272	590	3,333
Other long-term liabilities			557
Net cash used in operating activities	(407)	(8,539)	(138,248)
Cash flows from investing activities:
Purchases of property and equipment		(37)	(9,541)
Decrease (increase) in restricted cash			33
Purchases of short-term investments			(34,709)
Maturities of short-term investments			34,709
Net cash used in investing activities		(37)	(9,508)
Cash flows from financing activities:
Proceeds from debt issuances			22,256
Payments on debt	(485)	(1,343)	(20,365)
Payments of debt issuance costs			(453)
Proceeds from initial public offering			49,011
Deferred initial public offering costs			(1,838)
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs			66,405
Proceeds from bridge loan			1,017
Proceeds from issuance of common stock and common stock warrants		158	32,807
Proceeds from issuance of restricted common stock			338
Proceeds from exercise of warrants	13		(91)
Payments to employees for cancelled restricted common stock			197
Proceeds from exercise of stock options			106
Net cash (used in) provided by financing activities	(472)	(1,185)	149,390
Net (decrease) increase in cash and cash equivalents	(879)	(9,761)	1,634
Cash and cash equivalents, beginning of period	2,513	15,930
Cash and cash equivalents, end of period	$ 1,634	$ 6,169	$ 1,634