Secured Debt and Convertible Notes - Additional Information (Detail) (USD $)	1 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended	109 Months Ended				6 Months Ended			6 Months Ended	1 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended		6 Months Ended	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended			1 Months Ended		6 Months Ended
	May 31, 2014	Jul. 31, 2012	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2013 Warrant	Jun. 30, 2014	Dec. 31, 2012	Oct. 31, 2011	Aug. 29, 2010	Jun. 30, 2014 Term Loans	Jun. 30, 2014 Interest Payable In Cash Term Loans	Jun. 30, 2014 Interest Payable In Kind Term Loans	Jun. 30, 2014 First Installment	May 31, 2014 Convertible 2017 Notes	Jun. 30, 2014 Convertible 2017 Notes	Jun. 30, 2014 Convertible 2017 Notes Term Loans	Jun. 30, 2014 Convertible 2017 Notes Term Loans	Jun. 30, 2014 Senior Notes	Jun. 30, 2014 Final Installment	Jul. 31, 2012 2022 Notes	Jun. 30, 2014 2022 Notes	Jun. 30, 2013 2022 Notes	Jun. 30, 2014 2022 Notes	Jun. 30, 2013 2022 Notes	Dec. 31, 2013 2022 Notes	Jun. 30, 2014 2022 Notes Maximum	May 31, 2014 Loan Agreement	Jun. 30, 2014 Loan Agreement	Dec. 31, 2013 Loan Agreement	Aug. 31, 2010 Loan Agreement	May 31, 2014 Loan Agreement First Installment	Dec. 31, 2013 Restructure Period	Jun. 30, 2014 May 2014 Amendments
Debt Instrument [Line Items]
Debt instrument, maturity date				Jul. 01, 2022	Jul. 01, 2022												Mar. 15, 2017						Jul. 01, 2022				Mar. 15, 2017						May 31, 2017
Line of credit, maximum borrowing capacity																											$ 31,100,000
Line of Credit Facility, Current Borrowing Capacity																															22,800,000
Secured debt, discount																															1,600,000
Debt issuance cost			3,185,000	3,185,000		3,185,000														1,400,000											1,500,000
Convertible senior secured note, percentage of stock price														10.00%
Debt financing agreements additional ability by other party to invest in convertible debt														32,000,000
Outstanding principal amount of term loan													25,900,000
Accrued paid in kind interest				201,000									200,000			200,000	200,000
Conversion price per share of notes															$ 1.1584						$ 5.69		$ 5.69
Debt Conversion, Description															The 2017 Notes have a conversion price (the “Conversion Price”) equal to $1.1584 per share or .8663 shares per $1 principal amount of 2017 Notes.
Debt instrument, convertible, conversion price															1						1,000		1,000
Conversion Rate				175.6697	175.6697										0.8663		863.3						175.6697			202.0202
Restricted deposits			2,611,000	2,611,000		2,611,000									2,611,000
Debt instrument, interest rate										15.00%	5.00%	10.00%								7.50%
Common stock, shares authorized			150,000,000	150,000,000	150,000,000	150,000,000									17,500,000
Debt instrument, face amount								15,000,000								26,100,000	26,100,000			45,000,000
Estimated fair value of principal amount																31,200,000	31,200,000	31,200,000
Interest expense																300,000	300,000				500,000	600,000	1,000,000	1,300,000
Loan and security agreement on borrowings									5,000,000																					12,500,000
Proceeds from 2022 notes		5,400,000
End-of-term payment as percentage of amount borrowed		8.00%
Proceeds from issuance of common stock and common stock units						205,340,000																						5,100,000
Loan and security agreement outstanding principal amount																													5,100,000
Debt Instrument, repurchase amount					15,000,000		5,000,000	10,000,000
Debt instrument, interest rate, effective percentage					11.00%
Number of warrants outstanding					3
Number of shares of common stock exercisable for warrants					388,411
Exercise price of common stock					$ 1.18
Long term borrowing interest rate			9.00%	9.00%		9.00%																										13.00%
Percentage of payment on principal amount and interest due													50.00%						50.00%
Proceeds from issuance of 2017 Notes, net				25,907,000		68,207,000														40,900,000
Amortization of debt discount				1,199,000																	700,000	700,000	1,300,000	2,300,000
Long term debt interest rate																						40.00%
Amortization period of debt discount																						5 years
Amortization period of debt issuance cost																						5 years
2022 notes, conversion date		Jul. 01, 2017																				Jul. 01, 2017	Jul. 01, 2017
Discount rate used in computation of interest payment																									2.00%
Valuation rate of shares for conversion																									90.00%
Number of trading days for valuation																									10 days
Convertible notes converted to common stock																					18,100,000		18,100,000
Debt instrument reduced amount																									26,900,000
Common stock issuable upon conversion of debt																					3,179,608		3,179,608
Common stock issued in connection with settlement liabilities																							2,957,775
Common stock issued to settle convertible note related obligation																							4,900,000
Percentage repurchase price																							100.00%
Number of trading days required for redemption																							20 or more trading days
Excess to percentage of conversion price																							150.00%
Number of consecutive trading days required for redemption																							30 days
Debt instrument, periodic payment, principal	9,600,000
Debt instrument, outstanding principal balance			$ 1,000,000	$ 1,000,000		$ 1,000,000
Maturity date				Jul. 01, 2022	Jul. 01, 2022												Mar. 15, 2017						Jul. 01, 2022				Mar. 15, 2017						May 31, 2017