Income Taxes (Details 4) $ in Thousands	Dec. 31, 2017 USD ($)
Federal [Member]
Net operating loss carry-forwards	$ 74,000
Federal [Member] | Expiration 2025 [Member]
Net operating loss carry-forwards	4,100
Federal [Member] | Expiration 2026 [Member]
Net operating loss carry-forwards	25,500
Federal [Member] | Expiration 2027 [Member]
Net operating loss carry-forwards	15,500
Federal [Member] | OperatingLossCarryForwardsExpiration2028Member
Net operating loss carry-forwards	5,200
Federal [Member] | OperatingLossCarryForwardsExpiration2029Member
Net operating loss carry-forwards	7,700
Federal [Member] | OperatingLossCarryForwardsExpiration2030Member
Net operating loss carry-forwards	10,600
Federal [Member] | Expiration 2031 [Member]
Net operating loss carry-forwards	1,300
Federal [Member] | Expiration 2032 [Member]
Net operating loss carry-forwards	0
Federal [Member] | Expiration 2033 [Member]
Net operating loss carry-forwards	100
Federal [Member] | Expiration 2034 [Member]
Net operating loss carry-forwards	2,500
Federal [Member] | Expiration 2035 [Member]
Net operating loss carry-forwards	1,500
State [Member]
Net operating loss carry-forwards	26,200
State [Member] | Expiration 2028 [Member]
Net operating loss carry-forwards	2,700
State [Member] | Expiration 2029 [Member]
Net operating loss carry-forwards	5,800
State [Member] | Expiration 2030 [Member]
Net operating loss carry-forwards	11,000
State [Member] | Expiration 2034 [Member]
Net operating loss carry-forwards	1,500
State [Member] | Expiration 2035 [Member]
Net operating loss carry-forwards	800
California [Member]
Net operating loss carry-forwards	21,800
Other State [Member]
Net operating loss carry-forwards	$ 4,400