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Consolidated Statement of Stockholders' Equity (USD $) | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2010 | $ 15,480,629 | $ 127,313 | $ 326,505,080 | $ (311,271,486) | $ 119,722
Beginning Balance, Shares at Dec. 31, 2010 |  | 12,731,287 |  |  |
Net loss | (21,328,538) |  |  | (21,328,536) |
Unrealized gain on foreign currency translation | 40,032 |  |  |  | 40,032
Change in unrealized loss on securities available-for-sale | (119,041) |  |  |  | (119,041)
Issuance of common stock and warrants, net of issuance cost of $1,522,083, $900,992 and $2,051,699 in 2011,2012 and 2013 respectively | 13,792,340 | 95,251 | 13,697,089 |  |
Issuance of common stock and warrants, net of issuance cost of $1,522,083, $900,992 and $2,051,699 in 2011, 2012 and 2013 respectively, shares |  | 9,525,116 |  |  |
Common stock issued pursuant to employee benefit plan | 164,896 | 352 | 164,544 |  |
Common stock issued pursuant to employee benefit plan, shares |  | 35,164 |  |  |
Compensation expense from grant of options and restricted stock units (fair value) | 3,096,043 | 326 | 3,095,717 |  |
Compensation expense from grant of options and restricted stock units (fair value), shares |  | 32,631 |  |  |
Exercise of employee and director stock options | 2,386 | 17 | 2,369 |  |
Exercise of employee and director stock options, shares | 1,692 | 1,692 |  |  |
Exercise and net settlement of restricted stock units | (403,625) | 1,021 | (404,646) |  |
Exercise and net settlement of restricted stock units, shares |  | 102,065 |  |  |
Ending Balance at Dec. 31, 2011 | 10,725,124 | 224,280 | 343,060,153 | (332,600,022) | 40,713
Ending Balance, Shares at Dec. 31, 2011 |  | 22,427,955 |  |  |
Net loss | (28,491,153) |  |  | (28,491,153) |
Unrealized gain on foreign currency translation | 151,125 |  |  |  | 151,125
Change in unrealized loss on securities available-for-sale | 1,339 |  |  |  | 1,339
Issuance of common stock and warrants, net of issuance cost of $1,522,083, $900,992 and $2,051,699 in 2011,2012 and 2013 respectively | 28,725,507 | 145,460 | 28,580,047 |  |
Issuance of common stock and warrants, net of issuance cost of $1,522,083, $900,992 and $2,051,699 in 2011, 2012 and 2013 respectively, shares |  | 14,546,042 |  |  |
Common stock issued for external services | 175,235 | 1,021 | 174,214 |  |
Common stock issued for external services, shares |  | 102,058 |  |  |
Common stock issued pursuant to employee benefit plan | 97,017 | 1,299 | 95,718 |  |
Common stock issued pursuant to employee benefit plan, shares |  | 129,893 |  |  |
Compensation expense from grant of options and restricted stock units (fair value) | 2,655,884 | 1,825 | 2,654,059 |  |
Compensation expense from grant of options and restricted stock units (fair value), shares |  | 182,502 |  |  |
Exercise of employee and director stock options | 3,629 | 36 | 3,593 |  |
Exercise of employee and director stock options, shares | 3,629 | 3,629 |  |  |
Exercise and net settlement of restricted stock units | (59,090) | 1,142 | (60,232) |  |
Exercise and net settlement of restricted stock units, shares |  | 114,226 |  |  |
Ending Balance at Dec. 31, 2012 | 13,984,617 | 375,063 | 374,507,552 | (361,091,175) | 193,177
Ending Balance, Shares at Dec. 31, 2012 |  | 37,506,305 |  |  |
Net loss | (26,439,159) |  |  | (26,439,159) |
Unrealized gain on foreign currency translation | 57,568 |  |  |  | 57,568
Change in unrealized loss on securities available-for-sale | 1,356 |  |  |  | 1,356
Issuance of common stock and warrants, net of issuance cost of $1,522,083, $900,992 and $2,051,699 in 2011,2012 and 2013 respectively | 24,879,573 | 169,385 | 24,710,188 |  |
Issuance of common stock and warrants, net of issuance cost of $1,522,083, $900,992 and $2,051,699 in 2011, 2012 and 2013 respectively, shares |  | 16,938,575 |  |  |
Common stock issued for external services | 154,111 | 1,049 | 153,062 |  |
Common stock issued for external services, shares |  | 104,911 |  |  |
Common stock issued pursuant to employee benefit plan | 132,071 | 829 | 131,242 |  |
Common stock issued pursuant to employee benefit plan, shares |  | 82,863 |  |  |
Compensation expense from grant of options and restricted stock units (fair value) | 2,322,489 |  | 2,322,489 |  |
Compensation expense from grant of options and restricted stock units (fair value), shares |  |  |  |  |
Exercise of employee and director stock options | 3,452 | 35 | 3,417 |  |
Exercise of employee and director stock options, shares | 3,452 | 3,452 |  |  |
Exercise and net settlement of restricted stock units | (342,366) | 3,627 | (345,993) |  |
Exercise and net settlement of restricted stock units, shares |  | 362,657 |  |  |
Common stock issued as consideration in the acquisition of a patent portfolio | 200,000 | 1,395 | 198,605 |  |
Common stock issued as consideration in the acquisition of a patent portfolio, shares |  | 139,548 |  |  |
Ending Balance at Dec. 31, 2013 | $ 14,953,712 | $ 551,383 | $ 401,680,562 | $ (387,530,334) | $ 252,101
Ending Balance, Shares at Dec. 31, 2013 |  | 55,138,311 |  |  |

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