Senior Secured Debt and 2022 Notes - Additional Information (Detail)	1 Months Ended								3 Months Ended		12 Months Ended
	Feb. 28, 2017	Jan. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares	Sep. 30, 2016 USD ($) shares	Nov. 30, 2015 USD ($) Bond shares	Feb. 28, 2015 USD ($) Bond shares	Jun. 30, 2014 USD ($) $ / shares	Jul. 31, 2012 USD ($)	Mar. 31, 2017 USD ($) $ / shares shares	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($) shares
Debt Instrument [Line Items]
Aggregate principal amount outstanding							10.00%
Restricted deposits			$ 2,611,000						$ 2,611,000		$ 2,611,000
Common stock, shares authorized | shares			250,000,000						250,000,000		250,000,000
Outstanding principal amount			$ 8,221,000						$ 1,088,000		$ 8,221,000
Interest expense									714,000	$ 2,151,000
Non-cash interest expense									$ 80,000	1,057,000
Common stock shares issued | shares			7,074,246						15,065,551		7,074,246
First Installment
Debt Instrument [Line Items]
Aggregate outstanding principal amount of term loan							$ 25,900,000
Convertible 2017 Notes
Debt Instrument [Line Items]
Debt instrument, interest rate							10.00%
Debt instrument maturity date									Jun. 23, 2017		Mar. 15, 2017
Conversion Price | $ / shares							$ 344.83		$ 344.83
Debt Conversion, Description									The 2017 Notes have a conversion price (the “Conversion Price”) equal to $344.83 per share or 0.0029 shares per $1 principal amount of 2017 Notes.
Conversion Rate									0.0029
Debt instrument, face amount			$ 26,100,000						$ 16,500,000		$ 26,100,000
Debt instrument, convertible, conversion price									$ 1,000
Number of consecutive trading days required for redemption									10 days
Excess to percentage of conversion price									150.00%
Common stock, shares authorized | shares									60,000
Paid down principal outstanding									$ 9,616,000
Outstanding principal amount									16,500,000
Estimated fair value of principal amount			25,769,000						16,492,000		25,769,000
Debt Issuance Costs			4,200,000						1,500,000		4,200,000
Interest expense									600,000	700,000
Aggregate principal amount on sale of convertible notes			26,108,000						$ 16,492,000		26,108,000
Convertible 2017 Notes | Change In Accounting Method Accounted For As Change In Estimate
Debt Instrument [Line Items]
Percentage repurchase price									100.00%
Convertible 2017 Notes | Whitebox
Debt Instrument [Line Items]
Debt instrument maturity date	Jun. 23, 2017
2022 Notes
Debt Instrument [Line Items]
Debt instrument maturity date									Jul. 01, 2022
Conversion Price | $ / shares									$ 1,707.65
Conversion Rate									0.5856
Debt instrument, interest rate								7.50%
Debt instrument, convertible, conversion price									$ 1,000
Outstanding principal amount			$ 8,221,000						1,088,000		$ 8,221,000
Debt Issuance Costs								$ 1,400,000
Interest expense									20,000	400,000
Aggregate principal amount on sale of convertible notes								45,000,000
Proceeds from issuance of convertible debt, net								40,900,000
Discount on sale of convertible notes								$ 2,700,000
Non-cash interest expense									80,000	$ 1,100,000
Conversion of debt, expense									$ 1,200,000
Debt discounts and debt issue costs amortization 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
Discount rate used in computation of interest payment									2.00%
Convertible senior secured note, percentage of stock price									90.00%
Number of trading days for valuation									10 days
Common stock shares issued | shares		2,155,382	251,832	699,968	55,392	8,502					251,832
Number of bonds redeemed | Bond					2,500	2,000
Face value of each bond redeemed					$ 1,000	$ 1,000
Redemption of debt instrument		$ 8,400,000	$ 1,400,000	$ 11,400,000	2,500,000	2,000,000
Net gain (loss) on extinguishment of debt instrument		$ 1,000,000	$ 100,000	$ (900,000)	$ (50,000)	$ 300,000
Required principal amount in percentage									25.00%
2022 Notes | Make-Whole Fundamental Change | Maximum
Debt Instrument [Line Items]
Conversion Rate									0.6734
2022 Notes | Provisional Redemption
Debt Instrument [Line Items]
Number of consecutive trading days required for redemption									30 days
Excess to percentage of conversion price									150.00%
Number of trading days required for redemption									20 or more trading days
Term Loans
Debt Instrument [Line Items]
Debt instrument, interest rate									12.00%
Term Loans | Interest Payable In Cash
Debt Instrument [Line Items]
Debt instrument, interest rate									6.00%
Term Loans | Interest Payable In Kind
Debt Instrument [Line Items]
Debt instrument, interest rate									6.00%
Term Loans | First Installment
Debt Instrument [Line Items]
Accrued paid in kind interest							$ 200,000