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Subsequent Events - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 19, 2016 | Jun. 15, 2016 | Apr. 30, 2016 | Apr. 30, 2015 | Mar. 11, 2015
Subsequent Event [Line Items] |  |  |  |  |
Common stock, par value (in dollars per share) |  |  | $ 0.001 | $ 0.001 | $ 0.001
Issuance of common stock |  |  | $ 44 | $ 0 |
Offering-related expense |  |  | $ 18 | $ 0 |
Shares exchange during period (in shares) |  |  | 1,656,073 |  |
Exchanges, weighted average exercise price (in dollars per share) |  |  | $ 4.92 |  |
Shares granted (in shares) |  |  | 343,749 | 1,763,381 |
Grants in period, weighted average exercise price (in usd per share) |  |  | $ 5.33 | $ 7.92 |
Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Issuance of common stock |  | $ 4,300 |  |  |
Offering-related expense |  | $ 750 |  |  |
Shares exchange during period (in shares) | 1,793,781 |  |  |  |
Shares granted (in shares) | 1,568,191 |  |  |  |
Grants in period, weighted average exercise price (in usd per share) | $ 2.10 |  |  |  |
Minimum [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Exchanges, weighted average exercise price (in dollars per share) |  |  | 15.96 |  |
Minimum [Member] | Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Exchanges, weighted average exercise price (in dollars per share) | 4.55 |  |  |  |
Maximum [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Exchanges, weighted average exercise price (in dollars per share) |  |  | $ 5.64 |  |
Maximum [Member] | Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Exchanges, weighted average exercise price (in dollars per share) | $ 6.96 |  |  |  |
Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Shares issued in offering (in shares) |  | 2,000,000 |  |  |
Common stock, par value (in dollars per share) |  | $ 0.001 |  |  |
Share price (in usd per share) |  | $ 2.25 |  |  |
Common Stock [Member] | Over-Allotment Option [Member] | Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Shares issued in offering (in shares) |  | 258,749 |  |  |

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