STOCKHOLDERS' EQUITY, Share-based Compensation Arrangements (Details) (USD $) | 6 Months Ended | | 0 Months Ended |
Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jan. 09, 2013 |
Price Range 4.30 to 5.70 [Member] | Price Range 6.00 to 9.72 [Member] | Price Range 9.93 to 14.49 [Member] | Price Range 14.50 to 33.50 [Member] | Price Range 4.30 to 33.50 [Member] | Unvested Restricted Stock Awards and Restricted Stock Units [Member] | Unvested Restricted Stock Awards and Restricted Stock Units [Member] | Stock Options [Member] | Stock Options [Member] | 2007 Equity Incentive Plan [Member] | 2007 Equity Incentive Plan [Member] |
| | | | | | | | | | Vineyard [Member] |
Stock Incentive Plans [Abstract] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Number of shares available for future grant under the plan (in shares) | ' | ' | ' | ' | ' | ' | ' | ' | ' | 438,625 | ' |
Options [Abstract] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Outstanding at the beginning of the year (in shares) | ' | ' | ' | ' | ' | ' | ' | 1,824,000 | 1,332,000 | ' | ' |
Granted (in shares) | ' | ' | ' | ' | ' | ' | ' | 122,000 | 586,000 | ' | 412,000 |
Exercised (in shares) | ' | ' | ' | ' | ' | ' | ' | -8,000 | -28,000 | ' | ' |
Cancelled (in shares) | ' | ' | ' | ' | ' | ' | ' | -178,000 | -167,000 | ' | ' |
Outstanding at the end of the year (in shares) | ' | ' | ' | ' | ' | ' | ' | 1,760,000 | 1,723,000 | ' | ' |
Vested and expected to vest at the end of the year (in shares) | ' | ' | ' | ' | ' | ' | ' | 1,640,000 | 1,600,000 | ' | ' |
Exercisable at the end of the year (in shares) | ' | ' | ' | ' | ' | ' | ' | 860,000 | 625,000 | ' | ' |
Weighted Average Exercise Price [Abstract] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Outstanding at the beginning of the year (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | $15.07 | $14.65 | ' | ' |
Granted (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | $11.61 | $16.39 | ' | ' |
Exercised (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | $8.38 | $7.94 | ' | ' |
Cancelled (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | $14.82 | $18.36 | ' | ' |
Outstanding at the end of the period (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | $14.89 | $15.30 | ' | ' |
Vested and expected to vest at the end of the year (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | $14.81 | $15.12 | ' | ' |
Exercisable at the end of the year (in dollars per share) | ' | ' | ' | ' | ' | ' | ' | $13.50 | $11.45 | ' | ' |
Aggregate intrinsic value of options outstanding | ' | ' | ' | ' | ' | ' | ' | $1,200,000 | ' | ' | ' |
Aggregate intrinsic value of options vested and expected to vest | ' | ' | ' | ' | ' | ' | ' | 1,200,000 | ' | ' | ' |
Aggregate intrinsic value of options exercisable | ' | ' | ' | ' | ' | ' | ' | 1,200,000 | ' | ' | ' |
Weighted average remaining contractual term, options outstanding | ' | ' | ' | ' | ' | ' | ' | '7 years 10 months 10 days | ' | ' | ' |
Weighted average remaining contractual term, expected to vest | ' | ' | ' | ' | ' | ' | ' | '7 years 9 months 11 days | ' | ' | ' |
Weighted average remaining contractual term, options exercisable | ' | ' | ' | ' | ' | ' | ' | '6 years 9 months 25 days | ' | ' | ' |
Intrinsic value of options exercised during the period | ' | ' | ' | ' | ' | ' | ' | $27,000 | $194,000 | ' | ' |
Awards [Abstract] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Outstanding at the beginning of the year (in shares) | ' | ' | ' | ' | ' | 302,000 | 253,000 | ' | ' | ' | ' |
Granted (in shares) | ' | ' | ' | ' | ' | 173,000 | 32,000 | ' | ' | ' | ' |
Vested (in shares) | ' | ' | ' | ' | ' | -13,000 | -10,000 | ' | ' | ' | ' |
Cancelled (in shares) | ' | ' | ' | ' | ' | -7,000 | -1,000 | ' | ' | ' | ' |
Outstanding at the end of the year (in shares) | ' | ' | ' | ' | ' | 455,000 | 274,000 | ' | ' | ' | ' |
Weighted Average Grant Date Fair Value [Abstract] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Outstanding at the beginning of the year (in dollars per share) | ' | ' | ' | ' | ' | $16.63 | $15.79 | ' | ' | ' | ' |
Granted (in dollars per share) | ' | ' | ' | ' | ' | $10.98 | $14.36 | ' | ' | ' | ' |
Vested (in dollars per share) | ' | ' | ' | ' | ' | $14.53 | $20.47 | ' | ' | ' | ' |
Cancelled (in dollars per share) | ' | ' | ' | ' | ' | $14.03 | $20.25 | ' | ' | ' | ' |
Outstanding at the end of the year (in dollars per share) | ' | ' | ' | ' | ' | $14.58 | $15.44 | ' | ' | ' | ' |
Weighted-average remaining contractual term, restricted stock awards outstanding | ' | ' | ' | ' | ' | '2 years 7 months 24 days | ' | ' | ' | ' | ' |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Exercise price range, lower limit (in dollars per share) | $4.30 | $6 | $9.93 | $14.50 | $4.30 | ' | ' | ' | ' | ' | ' |
Exercise price range, upper limit (in dollars per share) | $5.70 | $9.72 | $14.49 | $28.70 | $28.70 | ' | ' | ' | ' | ' | ' |
Options, outstanding and exercisable at end of period [Abstract] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Outstanding options (in shares) | 181,000 | 139,000 | 543,000 | 897,000 | 1,760,000 | ' | ' | ' | ' | ' | ' |
Outstanding options, weighted average remaining contractual term | '5 years 4 months 24 days | '5 years 4 months 28 days | '9 years 2 months 23 days | '8 years 0 months 14 days | '7 years 10 months 10 days | ' | ' | ' | ' | ' | ' |
Outstanding options, weighted average exercise price (in dollars per share) | $5.07 | $7.73 | $13.68 | $18.71 | $14.89 | ' | ' | ' | ' | ' | ' |
Exercisable options (in shares) | 176,000 | 110,000 | 202,000 | 372,000 | 860,000 | ' | ' | ' | ' | ' | ' |
Exercisable options, weighted average exercise price (in dollars per share) | $5.06 | $7.27 | $13.64 | $19.26 | $13.50 | ' | ' | ' | ' | ' | ' |