|
Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2014
|
|---|---|
| Assets | |
| Total assets | $ 37,803 |
|
Stock warrants [Member]
|
|
| Liabilities | |
| Liabilities | 935 |
|
Cash [Member]
|
|
| Assets | |
| Total assets | 15,348 |
|
Money market securities [Member]
|
|
| Assets | |
| Total assets | 13,282 |
|
Restricted cash [Member]
|
|
| Assets | |
| Total assets | 251 |
|
Corporate bonds and commercial paper [Member]
|
|
| Assets | |
| Total assets | 8,922 |
|
Level 1 [Member]
|
|
| Assets | |
| Total assets | 28,881 |
|
Level 1 [Member] | Stock warrants [Member]
|
|
| Liabilities | |
| Liabilities | |
|
Level 1 [Member] | Cash [Member]
|
|
| Assets | |
| Total assets | 15,348 |
|
Level 1 [Member] | Money market securities [Member]
|
|
| Assets | |
| Total assets | 13,282 |
|
Level 1 [Member] | Restricted cash [Member]
|
|
| Assets | |
| Total assets | 251 |
|
Level 1 [Member] | Corporate bonds and commercial paper [Member]
|
|
| Assets | |
| Total assets | |
|
Level 2 [Member]
|
|
| Assets | |
| Total assets | 8,922 |
|
Level 2 [Member] | Stock warrants [Member]
|
|
| Liabilities | |
| Liabilities | |
|
Level 2 [Member] | Cash [Member]
|
|
| Assets | |
| Total assets | |
|
Level 2 [Member] | Money market securities [Member]
|
|
| Assets | |
| Total assets | |
|
Level 2 [Member] | Restricted cash [Member]
|
|
| Assets | |
| Total assets | |
|
Level 2 [Member] | Corporate bonds and commercial paper [Member]
|
|
| Assets | |
| Total assets | 8,922 |
|
Level 3 [Member]
|
|
| Assets | |
| Total assets | |
|
Level 3 [Member] | Stock warrants [Member]
|
|
| Liabilities | |
| Liabilities | 935 |
|
Level 3 [Member] | Cash [Member]
|
|
| Assets | |
| Total assets | |
|
Level 3 [Member] | Money market securities [Member]
|
|
| Assets | |
| Total assets | |
|
Level 3 [Member] | Restricted cash [Member]
|
|
| Assets | |
| Total assets | |
|
Level 3 [Member] | Corporate bonds and commercial paper [Member]
|
|
| Assets | |
| Total assets |