Warrants - Summary of Warrant Activity (Detail) - $ / shares | May 25, 2016 | Jun. 30, 2016 |
Class of Warrant or Right [Line Items] | | |
Warrants, Exercise Price (usd per share) | | $ 5.59 |
Class of Warrants Outstanding [Roll Forward] | | |
Warrants outstanding, beginning balance (in shares) | | 4,432,000 |
Warrants issued (in shares) | | 1,357,000 |
Warrants expired (in shares) | | (157,000) |
Warrants outstanding, ending balance (in shares) | | 5,632,000 |
Warrant Issued With | Warrants Other Warrants | | |
Class of Warrant or Right [Line Items] | | |
Warrants, Exercise Price (usd per share) | | $ 5.59 |
Class of Warrants Outstanding [Roll Forward] | | |
Warrants outstanding, beginning balance (in shares) | | 4,372,000 |
Warrants issued (in shares) | | 1,357,000 |
Warrants expired (in shares) | | (97,000) |
Warrants outstanding, ending balance (in shares) | | 5,632,000 |
Warrant Issued For | Warrant Derivative | | |
Class of Warrant or Right [Line Items] | | |
Warrants, Exercise Price (usd per share) | | $ 0 |
Class of Warrants Outstanding [Roll Forward] | | |
Warrants outstanding, beginning balance (in shares) | | 60,000 |
Warrants issued (in shares) | | 0 |
Warrants expired (in shares) | | (60,000) |
Warrants outstanding, ending balance (in shares) | | 0 |
Debt guarantee | Warrant Issued With | Warrants Other Warrants | | |
Class of Warrant or Right [Line Items] | | |
Warrants, Exercise Price (usd per share) | | $ 15 |
Class of Warrants Outstanding [Roll Forward] | | |
Warrants outstanding, beginning balance (in shares) | | 233,000 |
Warrants issued (in shares) | | 0 |
Warrants expired (in shares) | | (87,000) |
Warrants outstanding, ending balance (in shares) | | 146,000 |
Financing | Warrant Issued With | Warrants Other Warrants | | |
Class of Warrant or Right [Line Items] | | |
Warrants, Exercise Price (usd per share) | | $ 10 |
Class of Warrants Outstanding [Roll Forward] | | |
Warrants outstanding, beginning balance (in shares) | | 243,000 |
Warrants issued (in shares) | | 0 |
Warrants expired (in shares) | | 0 |
Warrants outstanding, ending balance (in shares) | | 243,000 |
Financing | Warrant Issued With | Warrants Other Warrants | | |
Class of Warrant or Right [Line Items] | | |
Warrants, Exercise Price (usd per share) | | $ 15 |
Class of Warrants Outstanding [Roll Forward] | | |
Warrants outstanding, beginning balance (in shares) | | 436,000 |
Warrants issued (in shares) | | 0 |
Warrants expired (in shares) | | 0 |
Warrants outstanding, ending balance (in shares) | | 436,000 |
Consulting | Warrant Issued With | Warrants Other Warrants | | |
Class of Warrant or Right [Line Items] | | |
Warrants, Exercise Price (usd per share) | | $ 10 |
Class of Warrants Outstanding [Roll Forward] | | |
Warrants outstanding, beginning balance (in shares) | | 10,000 |
Warrants issued (in shares) | | 0 |
Warrants expired (in shares) | | (10,000) |
Warrants outstanding, ending balance (in shares) | | 0 |
Financing | Warrant Issued For | Warrant Derivative | | |
Class of Warrant or Right [Line Items] | | |
Warrants, Exercise Price (usd per share) | | $ 4 |
Class of Warrants Outstanding [Roll Forward] | | |
Warrants outstanding, beginning balance (in shares) | | 60,000 |
Warrants issued (in shares) | | 0 |
Warrants expired (in shares) | | (60,000) |
Warrants outstanding, ending balance (in shares) | | 0 |
2015 Offering | Warrant Issued With | Warrants Other Warrants | | |
Class of Warrant or Right [Line Items] | | |
Warrants, Exercise Price (usd per share) | | $ 5 |
Class of Warrants Outstanding [Roll Forward] | | |
Warrants outstanding, beginning balance (in shares) | | 3,450,000 |
Warrants issued (in shares) | | 0 |
Warrants expired (in shares) | | 0 |
Warrants outstanding, ending balance (in shares) | | 3,450,000 |
2016 Offering | | |
Class of Warrants Outstanding [Roll Forward] | | |
Warrants issued (in shares) | 1,357,301 | |
2016 Offering | Warrant Issued With | Warrants Other Warrants | | |
Class of Warrant or Right [Line Items] | | |
Warrants, Exercise Price (usd per share) | | $ 2.25 |
Class of Warrants Outstanding [Roll Forward] | | |
Warrants outstanding, beginning balance (in shares) | | 0 |
Warrants issued (in shares) | | 1,357,000 |
Warrants expired (in shares) | | 0 |
Warrants outstanding, ending balance (in shares) | | 1,357,000 |