|
Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
|
12 Months Ended |
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
| Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |
|
|
|
| Cash, cash equivalents and marketable securities |
$ 189,400,000 |
|
|
| Number of reporting units |
1 |
|
|
| Unrecognized tax benefits |
0 |
|
|
| Unrecognized tax benefits, accrued amounts for interest and penalties |
0 |
|
|
| Amount reclassified out of accumulated other comprehensive (loss) income |
0 |
|
|
| Number of Operating Segment |
1 |
|
|
|
United States
|
|
|
|
| Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |
|
|
|
| Percentage of revenue earned |
89.00% |
88.00% |
94.00% |
| Percentage of long lived assets |
9.00% |
10.00% |
|
|
Maximum
|
|
|
|
| Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |
|
|
|
| Cash equivalents original maturity period |
3 months |
|
|
|
Rhein
|
|
|
|
| Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |
|
|
|
| Currency translation adjustments |
500,000 |
400,000 |
(300,000) |
| Currency transaction gain (loss) |
$ (200,000) |
$ (200,000) |
$ 200,000 |