Marketable Securities and Fair Value Disclosures - Summary of Marketable securities (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 16,133
Fair Value	16,114
Short-term available-for-sale securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,778
Gross Unrealized Losses	(16)
Fair Value	13,762
Short-term available-for-sale securities | Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,778
Gross Unrealized Losses	(16)
Fair Value	13,762
Long-term available-for-sale securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,355
Gross Unrealized Gains	3
Gross Unrealized Losses	(6)
Fair Value	2,352
Long-term available-for-sale securities | Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,355
Gross Unrealized Gains	3
Gross Unrealized Losses	(6)
Fair Value	$ 2,352