Note L - Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
| Financial liabilities measured at fair value on recurring basis |
$ 4,618
|
$ 37,839
|
| Financial assets measured at fair value on recurring basis |
59,203
|
19,002
|
| Certificates of Deposit [Member] |
|
|
| Financial assets measured at fair value on recurring basis |
7,788
|
8,951
|
| US Treasury Securities [Member] |
|
|
| Financial assets measured at fair value on recurring basis |
37,066
|
4,996
|
| US Government Corporations and Agencies Securities [Member] |
|
|
| Financial assets measured at fair value on recurring basis |
14,349
|
5,055
|
| Fair Value, Inputs, Level 1 [Member] |
|
|
| Financial liabilities measured at fair value on recurring basis |
|
|
| Financial assets measured at fair value on recurring basis |
44,854
|
19,002
|
| Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member] |
|
|
| Financial assets measured at fair value on recurring basis |
7,788
|
8,951
|
| Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] |
|
|
| Financial assets measured at fair value on recurring basis |
37,066
|
4,996
|
| Fair Value, Inputs, Level 1 [Member] | US Government Corporations and Agencies Securities [Member] |
|
|
| Financial assets measured at fair value on recurring basis |
|
5,055
|
| Fair Value, Inputs, Level 2 [Member] |
|
|
| Financial liabilities measured at fair value on recurring basis |
|
|
| Financial assets measured at fair value on recurring basis |
14,349
|
|
| Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] |
|
|
| Financial assets measured at fair value on recurring basis |
|
|
| Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |
|
|
| Financial assets measured at fair value on recurring basis |
|
|
| Fair Value, Inputs, Level 2 [Member] | US Government Corporations and Agencies Securities [Member] |
|
|
| Financial assets measured at fair value on recurring basis |
14,349
|
|
| Fair Value, Inputs, Level 3 [Member] |
|
|
| Financial liabilities measured at fair value on recurring basis |
4,618
|
37,839
|
| Financial assets measured at fair value on recurring basis |
|
|
| Fair Value, Inputs, Level 3 [Member] | Certificates of Deposit [Member] |
|
|
| Financial assets measured at fair value on recurring basis |
|
|
| Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member] |
|
|
| Financial assets measured at fair value on recurring basis |
|
|
| Fair Value, Inputs, Level 3 [Member] | US Government Corporations and Agencies Securities [Member] |
|
|
| Financial assets measured at fair value on recurring basis |
|
|
| Underwriter Warrant Liability [Member] |
|
|
| Financial liabilities measured at fair value on recurring basis |
16
|
3,877
|
| Underwriter Warrant Liability [Member] | Fair Value, Inputs, Level 1 [Member] |
|
|
| Financial liabilities measured at fair value on recurring basis |
|
|
| Underwriter Warrant Liability [Member] | Fair Value, Inputs, Level 2 [Member] |
|
|
| Financial liabilities measured at fair value on recurring basis |
|
|
| Underwriter Warrant Liability [Member] | Fair Value, Inputs, Level 3 [Member] |
|
|
| Financial liabilities measured at fair value on recurring basis |
16
|
3,877
|
| Deerfield Warrant Liability [Member] |
|
|
| Financial liabilities measured at fair value on recurring basis |
4,231
|
33,750
|
| Deerfield Warrant Liability [Member] | Fair Value, Inputs, Level 1 [Member] |
|
|
| Financial liabilities measured at fair value on recurring basis |
|
|
| Deerfield Warrant Liability [Member] | Fair Value, Inputs, Level 2 [Member] |
|
|
| Financial liabilities measured at fair value on recurring basis |
|
|
| Deerfield Warrant Liability [Member] | Fair Value, Inputs, Level 3 [Member] |
|
|
| Financial liabilities measured at fair value on recurring basis |
4,231
|
33,750
|
| Embedded Put Option [Member] |
|
|
| Financial liabilities measured at fair value on recurring basis |
365
|
212
|
| Embedded Put Option [Member] | Fair Value, Inputs, Level 1 [Member] |
|
|
| Financial liabilities measured at fair value on recurring basis |
|
|
| Embedded Put Option [Member] | Fair Value, Inputs, Level 2 [Member] |
|
|
| Financial liabilities measured at fair value on recurring basis |
|
|
| Embedded Put Option [Member] | Fair Value, Inputs, Level 3 [Member] |
|
|
| Financial liabilities measured at fair value on recurring basis |
365
|
$ 212
|
| Fundamental Change and Make-Whole Interest Provisions Embedded in 2021 Notes [Member] |
|
|
| Financial liabilities measured at fair value on recurring basis |
6
|
|
| Fundamental Change and Make-Whole Interest Provisions Embedded in 2021 Notes [Member] | Fair Value, Inputs, Level 1 [Member] |
|
|
| Financial liabilities measured at fair value on recurring basis |
|
|
| Fundamental Change and Make-Whole Interest Provisions Embedded in 2021 Notes [Member] | Fair Value, Inputs, Level 2 [Member] |
|
|
| Financial liabilities measured at fair value on recurring basis |
|
|
| Fundamental Change and Make-Whole Interest Provisions Embedded in 2021 Notes [Member] | Fair Value, Inputs, Level 3 [Member] |
|
|
| Financial liabilities measured at fair value on recurring basis |
$ 6
|
|