CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	9 Months Ended		102 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011
Cash flows from operating activities:
Net loss	$ (2,973)	$ (19,933)	$ (171,266)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation and amortization	8	1,019	9,066
Amortization of lease incentive		(4)	(474)
Common stock issued for licenses	0		147
Stock-based compensation expense	780	4,704	20,594
Noncash license fee			54
Noncash interest expense related to debt and warrants	383	193	1,520
Noncash (income) expense related to change in fair value of warrant liability	42	(3,117)	(6,035)
Provisions on inventory		2,570	5,846
Gain (loss) on disposal of property and equipment		(23)	(7)
Impairment of long-lived assets	0	1,894	1,894
Changes in operating assets and liabilities:
Accounts receivable	(50)	651	(317)
Unbilled receivable	479	73	25
Inventory		(1,013)	(11,226)
Prepaid expenses and other current assets	91	42	(541)
Deferred revenue	666	1,514	7,893
Accounts payable	(215)	(188)	579
Accrued expenses and other current liabilities	(32)	(569)	3,029
Other long-term liabilities			557
Net cash used in operating activities	(821)	(12,187)	(138,662)
Cash flows from investing activities:
Purchases of property and equipment	0	(37)	(9,541)
Proceeds from sale of fixed assets	75	33	108
Purchases of short-term investments			(34,709)
Maturities of short-term investments			34,709
Net cash (used in) provided by investing activities	75	(4)	(9,433)
Cash flows from financing activities:
Proceeds from debt issuances	0		22,256
Payments on debt	(1,230)	(2,050)	(21,110)
Payments of debt issuance costs			(453)
Proceeds from initial public offering	0		49,011
Deferred initial public offering costs			(1,838)
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs	0		66,405
Proceeds from bridge loan			1,017
Proceeds from issuance of common stock and common stock warrants	0	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	0	3	106
Net cash (used in) provided by financing activities	(1,217)	(1,889)	148,645
Net (decrease) increase in cash and cash equivalents	(1,963)	(14,080)	550
Cash and cash equivalents, beginning of period	2,513	15,930
Cash and cash equivalents, end of period	$ 550	$ 1,850	$ 550