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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 Segment | Dec. 31, 2012 | Dec. 31, 2011
Cash Equivalents and Concentrations of Credit Risk [Abstract] |  |  |  |  |  |  |  |  |  |  |
Maximum number of months of investments with original maturities from date of acquisition to be cash equivalents |  |  |  |  |  |  |  |  | 3 months |  |
Calculation of net loss and the number of shares used to compute basic and diluted earnings per share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net loss - basic | $ (4,792) | $ (7,206) | $ (5,482) | $ (12,845) | $ (10,657) | $ (11,813) | $ (14,512) | $ (14,889) | $ (30,324) | $ (51,868) | $ (30,885)
Adjust for gain on warrant derivative liability |  |  |  |  |  |  |  |  | (1,835) | 0 | 0
Net loss - diluted |  |  |  |  |  |  |  |  | $ (32,159) | $ (51,868) | $ (30,885)
Net loss per share - basic (in dollars per share) | $ (0.04) | $ (0.07) | $ (0.06) | $ (0.15) | $ (0.14) | $ (0.18) | $ (0.26) | $ (0.31) | $ (0.30) | $ (0.85) | $ (0.68)
Weighted average shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  | 100,809,824 | 61,275,527 | 45,236,921
Warrant exercises (in shares) |  |  |  |  |  |  |  |  | 4,294,353 | 0 | 0
Weighted average shares outstanding - diluted (in dollars per share) |  |  |  |  |  |  |  |  | 105,104,177 | 61,275,527 | 45,236,921
Net loss per share - diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.31) | $ (0.85) | $ (0.68)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares excluded from the computation of diluted EPS (in shares) |  |  |  |  |  |  |  |  | 13,792,865 | 10,932,935 | 6,836,215
Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of business segments |  |  |  |  |  |  |  |  | 1 |  |
Stock options [Member] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares excluded from the computation of diluted EPS (in shares) |  |  |  |  |  |  |  |  | 4,035,143 | 4,788,887 | 4,129,749
Unvested restricted shares [Member] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares excluded from the computation of diluted EPS (in shares) |  |  |  |  |  |  |  |  | 325,722 | 501,468 | 193,532
Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares excluded from the computation of diluted EPS (in shares) |  |  |  |  |  |  |  |  | 9,432,000 | 5,642,580 | 2,512,934
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 3 years |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  | 7 years |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Customers individually accounted for greater than 10% |  |  |  |  |  |  |  |  | 3 |  |
Product revenue [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Customers individually accounted for greater than 10% |  |  |  |  |  |  |  |  | 4 |  |

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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