Accounts Receivable (Detail) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Mar. 31, 2016 |
|
| Receivables [Abstract] | |||||
| Billed | $ 11,332 | $ 11,332 | $ 13,220 | ||
| Unbilled | 6,616 | 6,616 | 4,763 | ||
| Allowance for doubtful accounts | (471) | (471) | (464) | ||
| Accounts receivable, net | 17,477 | 17,477 | $ 17,519 | ||
| Write-offs | $ 28 | $ 164 | $ 405 | $ 164 | |