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Equity Transactions - Schedule of Reconciliation of Warrant Liability, Additional Paid-in Capital, Accumulated Defecit and Change in Fair Value of Warrant Liability on Balance Sheets (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | --- | --- | ---
Class Of Stock [Line Items] |  |  |  |  |
Related-party notes payable, net of discount & issuance costs of $0 (2017) and $619 (2016) |  |  |  | $ 1,295 |
Notes payable, net of discount & issuance costs of $508 (2017) and $619 (2016) | $ 1,492 |  |  | 1,295 |
Accumulated comprehensive deficit | $ (232,773) |  |  | (226,228) |
ASU 2017-11 [Member] |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Related-party notes payable, net of discount & issuance costs of $0 (2017) and $619 (2016) |  | $ 1,425 | $ 1,360 | 1,295 | $ 1,242
Notes payable, net of discount & issuance costs of $508 (2017) and $619 (2016) |  | 1,425 | 1,360 | 1,295 | 1,242
Additional paid-in capital |  | 232,046 | 229,650 | 229,274 | 228,926
Accumulated comprehensive deficit |  | (231,063) | (229,108) | (226,228) | (222,503)
ASU 2017-11 [Member] | Change in Valuation of Notes Payable [Member] |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Related-party notes payable, net of discount & issuance costs of $0 (2017) and $619 (2016) |  | 267 | 298 | 328 | 359
Notes payable, net of discount & issuance costs of $508 (2017) and $619 (2016) |  | 267 | 298 | 328 | 359
Additional paid-in capital |  | (534) | (596) | (656) | (718)
ASU 2017-11 [Member] | Reclassification of Warrant Liability [Member] |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Warrant liability |  | (1,063) | (502) | (1,210) | (1,761)
Additional paid-in capital |  | 1,063 | 502 | 1,210 | 1,761
ASU 2017-11 [Member] | Change in Fair Value of Warrant Liability [Member] |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Additional paid-in capital |  | 1,060 | 1,618 | 910 | 335
Accumulated comprehensive deficit |  | (1,060) | (1,618) | (910) | (335)
ASU 2017-11 [Member] | Change in Interest (Expense) Income Net [Member] |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Additional paid-in capital |  | (200) | (139) | (79) | (17)
Accumulated comprehensive deficit |  | 200 | 139 | 79 | 17
ASU 2017-11 [Member] | Previously Reported [Member] |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |
Related-party notes payable, net of discount & issuance costs of $0 (2017) and $619 (2016) |  | 1,158 | 1,062 | 967 | 883
Notes payable, net of discount & issuance costs of $508 (2017) and $619 (2016) |  | 1,158 | 1,062 | 967 | 883
Warrant liability |  | 1,063 | 502 | 1,210 | 1,761
Additional paid-in capital |  | 230,657 | 228,265 | 227,889 | 227,565
Accumulated comprehensive deficit |  | $ (230,203) | $ (227,629) | $ (225,397) | $ (222,185)

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