Revenue Recognition - Summary of Transaction Price Allocated to Future Performance Obligations (Detail)
$ in Thousands |
Mar. 31, 2018
USD ($)
|
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
|
| Total |
$ 27,086
|
| Deferred Revenue [Member] |
|
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
|
| Total |
17,261
|
| Unbilled Backlog [Member] |
|
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
|
| Total |
9,825
|
| Current [Member] |
|
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
|
| Total |
20,232
|
| Current [Member] | Deferred Revenue [Member] |
|
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
|
| Total |
15,889
|
| Current [Member] | Unbilled Backlog [Member] |
|
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
|
| Total |
4,343
|
| Long-term [Member] |
|
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
|
| Total |
6,854
|
| Long-term [Member] | Deferred Revenue [Member] |
|
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
|
| Total |
1,372
|
| Long-term [Member] | Unbilled Backlog [Member] |
|
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
|
| Total |
$ 5,482
|