|
Significant Accounting Policies - Fair Value of the Company's Investments by Type (Detail) (USD $)
In Thousands, unless otherwise specified
|
Dec. 31, 2013
|
Dec. 31, 2012
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
|
| Amortized Cost |
$ 19,421 |
$ 15,775 |
| Accrued Interest |
48 |
57 |
| Gross Unrealized Gains |
5 |
27 |
| Gross Unrealized Losses |
1 |
|
| Estimated Fair Value |
19,473 |
15,859 |
|
Level 2 [Member] | Obligations of U.S. Government and its Agencies [Member]
|
|
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
|
| Amortized Cost |
4,899 |
3,505 |
| Accrued Interest |
1 |
6 |
| Gross Unrealized Gains |
1 |
2 |
| Gross Unrealized Losses |
|
|
| Estimated Fair Value |
4,901 |
3,513 |
|
Level 2 [Member] | Corporate Debt Securities [Member]
|
|
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
|
| Amortized Cost |
8,528 |
4,035 |
| Accrued Interest |
47 |
22 |
| Gross Unrealized Gains |
2 |
6 |
| Gross Unrealized Losses |
1 |
|
| Estimated Fair Value |
8,576 |
4,063 |
|
Level 2 [Member] | Commercial Paper [Member]
|
|
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
|
| Amortized Cost |
5,994 |
1,695 |
| Accrued Interest |
|
|
| Gross Unrealized Gains |
2 |
1 |
| Gross Unrealized Losses |
|
|
| Estimated Fair Value |
5,996 |
1,696 |
|
Level 2 [Member] | U.S. Treasury Securities [Member]
|
|
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
|
| Amortized Cost |
|
999 |
| Accrued Interest |
|
2 |
| Gross Unrealized Gains |
|
2 |
| Gross Unrealized Losses |
|
|
| Estimated Fair Value |
|
1,003 |
|
Level 2 [Member] | Municipal Obligations [Member]
|
|
|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
|
|
| Amortized Cost |
|
5,541 |
| Accrued Interest |
|
27 |
| Gross Unrealized Gains |
|
16 |
| Gross Unrealized Losses |
|
|
| Estimated Fair Value |
|
$ 5,584 |