Fair Value - Fair Value of Financial Assets (Excluding Cash) and Financial Liabilities (Detail) (USD $) | Sep. 30, 2013 | Dec. 31, 2012 |
In Thousands, unless otherwise specified |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total financial assets | $18,303 | $18,298 |
Total financial liabilities | 351 | 483 |
Money Market Funds [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total financial assets | 18,303 | 18,298 |
Lease Liabilities Incurred in Connection with the Restructuring Plan [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total financial liabilities | 351 | 483 |
Fair Value Measurements Recurring [Member] | Fair Value Measured Using Level 1 [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total financial assets | 18,303 | 18,298 |
Total financial liabilities | ' | ' |
Fair Value Measurements Recurring [Member] | Fair Value Measured Using Level 1 [Member] | Money Market Funds [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total financial assets | 18,303 | 18,298 |
Fair Value Measurements Recurring [Member] | Fair Value Measured Using Level 1 [Member] | Lease Liabilities Incurred in Connection with the Restructuring Plan [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total financial liabilities | ' | ' |
Fair Value Measurements Recurring [Member] | Fair Value Measured Using Level 2 [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total financial assets | ' | ' |
Total financial liabilities | ' | ' |
Fair Value Measurements Recurring [Member] | Fair Value Measured Using Level 2 [Member] | Money Market Funds [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total financial assets | ' | ' |
Fair Value Measurements Recurring [Member] | Fair Value Measured Using Level 2 [Member] | Lease Liabilities Incurred in Connection with the Restructuring Plan [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total financial liabilities | ' | ' |
Fair Value Measurements Recurring [Member] | Fair Value Measured Using Level 3 [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total financial assets | ' | ' |
Total financial liabilities | 351 | 483 |
Fair Value Measurements Recurring [Member] | Fair Value Measured Using Level 3 [Member] | Money Market Funds [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total financial assets | ' | ' |
Fair Value Measurements Recurring [Member] | Fair Value Measured Using Level 3 [Member] | Lease Liabilities Incurred in Connection with the Restructuring Plan [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total financial liabilities | $351 | $483 |