Marketable Securities - Summary of Future Maturities of Available-For-Sale Securities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized cost, maturities less than twelve months	$ 197
Available-for-sale securities, Fair value, maturities less than twelve months	437
Available-for-sale securities, Amortized cost, maturities greater than twelve months	0
Available-for-sale securities, Fair value, maturities greater than twelve months	0
Common stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Amortized cost, maturities less than twelve months	197
Available-for-sale securities, Fair value, maturities less than twelve months	437
Available-for-sale securities, Amortized cost, maturities greater than twelve months	0
Available-for-sale securities, Fair value, maturities greater than twelve months	$ 0