Other Assets	9 Months Ended
Other Assets	Sep. 30, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Assets	Other Assets Purchases of Patents and Patent Licenses From time to time, we enter into agreements to purchase patents or patent licenses. The carrying value, net of amortization, of our purchased patents and patent licenses was $2.6 million and $2.9 million as of September 30, 2019 and December 31, 2018, respectively. As of September 30, 2019 and December 31, 2018, $0.5 million of patent costs were included in other current assets and $2.1 million and $2.4 million of patent costs were included in other assets, respectively. We have $5.9 million of historical cost in purchased patents and patent licenses. We are amortizing the patent costs over the estimated useful lives of the patents, which range from three years to twelve years. Patent cost amortization of $0.1 million and $0.3 million for the three and nine months ended September 30, 2019, respectively, as compared to $0.1 million and $0.4 million for the same periods in the prior year, was included in cost of SaaS and license revenue in our condensed consolidated statements of operations. Patent cost amortization of less than $0.1 million and $0.1 million was included in amortization and depreciation in our condensed consolidated statements of operations for the three and nine months ended September 30, 2019, respectively. There was no amortization of patent costs included in amortization and depreciation during the three and nine months ended September 30, 2018. Loan to a Distribution Partner In September 2016, we entered into dealer and loan agreements with a distribution partner. The dealer agreement enables the distribution partner to resell our SaaS services and hardware to their subscribers. Under the loan agreements, we agreed to loan the distribution partner up to $4.0 million, collateralized by all assets owned by the distribution partner. The advance period for the loan was amended in August 2017 to begin each year on September 1 and end each year on December 31. Interest on the outstanding principal accrued at a rate per annum equal to the greater of 6.0% or the Eurodollar Base Rate, or LIBOR, plus 4.0%, as determined on the first date of each annual advance period. The repayment of principal and accrued interest was due in three installments beginning in July and ending in August following the advance period. The term date of the loan was August 31, 2019; however, the borrower had the option to extend the term of the loan for two successive terms of one year each. In May 2018, the loan agreement with our distribution partner was amended to convert the entire $4.0 million note receivable outstanding into a $4.0 million term loan. The term loan matures on July 31, 2022 and requires annual principal repayments of $1.0 million on July 31 of each year. We received the first $1.0 million principal payment due under this term loan in July 2019. The term loan also requires monthly interest payments, with interest accruing on the outstanding principal balance at a rate per annum equal to 6.0% through June 30, 2018 and a rate per annum equal to the LIBOR rate on the first of any interest period plus 7.0% beginning on July 1, 2018. As of September 30, 2019 and December 31, 2018, $1.0 million of the note receivable balance was included in other current assets in our condensed consolidated balance sheets. As of September 30, 2019 and December 31, 2018, $2.0 million and $3.0 million of the note receivable balance was included in other assets in our condensed consolidated balance sheets, respectively. In April 2017, we entered into a subordinated credit agreement with an affiliated entity of the distribution partner and loaned the affiliated entity $3.0 million, with a maturity date of November 21, 2022. Interest on the outstanding principal balance accrues at a rate of 8.5% per annum and requires monthly interest payments. The $3.0 million loan receivable balance was included in other assets as of September 30, 2019 and December 31, 2018. For the three and nine months ended September 30, 2019, we recognized $0.4 million and $1.3 million of revenue from the distribution partners associated with these loans, respectively, as compared to $0.2 million and $0.9 million for the same periods in the prior year. Loan to a Hardware Supplier In October 2018, we entered into a subordinate convertible promissory note with one of our hardware suppliers, or the October 2018 Promissory Note, which was amended in November 2018, January 2018 and February 2019 as a result of the hardware supplier's financial restructuring. In March 2019, we entered into a separate secured promissory note with the same hardware supplier, which, together with the October 2018 Promissory Note, we refer to as the Promissory Notes. Under the Promissory Notes, we agreed to provide the hardware supplier loans of up to $7.4 million, collateralized by all assets owned by the supplier. Interest on the outstanding principal accrued at a rate per annum equal to 12.0%, of which 6.0% per annum was payable in cash and the remaining 6.0% per annum was payable in kind. Payment of accrued interest was due quarterly beginning with the quarter ended March 31, 2019. The repayment of principal was due at the term date, which was the earlier of (i) the five-year anniversary of the issuance date of each of the Promissory Notes, (ii) the occurrence of a change of control, (iii) one day following the maturity day of the hardware supplier's senior indebtedness or (iv) immediately upon the acceleration of the hardware supplier's senior indebtedness. In March 2019, we also purchased and acquired a secured promissory note, or the Acquired Promissory Note, that matured on March 30, 2019 and was originally executed between our hardware supplier and another third-party secured creditor. The Acquired Promissory Note had an outstanding balance of $26.6 million as of December 31, 2018, including interest. Interest on the outstanding principal accrued at a rate per annum equal to 13.0%. Under the terms of the Acquired Promissory Note, we paid $16.4 million to the third-party secured creditor in exchange for all of the rights associated with the Acquired Promissory Note, including a security interest and a right to enforce that interest against all assets owned by the hardware supplier. In addition to the $16.4 million paid in March 2019, we agreed to pay the third-party secured creditor an additional $6.0 million, subject to certain contingencies measured as of May 4, 2019. Based on the outcome of those contingencies, we recorded a $6.0 million liability in March 2019 related to the Acquired Promissory Note and paid the $6.0 million contingent liability during the three months ended September 30, 2019. The fair value of the Acquired Promissory Note at the date of purchase was $22.4 million, which represented the initial cash consideration paid in March 2019 and the contingent consideration paid in September 2019. On May 6, 2019, we entered into a forbearance agreement with the hardware supplier, or the Forbearance Agreement. Under the Forbearance Agreement, the hardware supplier agreed to pay us the outstanding balance of principal and interest under the Promissory Notes and the Acquired Promissory Note before June 30, 2019. In consideration for the full and timely payments under the Forbearance Agreement, we agreed to temporarily forbear from exercising the remedies available to us with respect to the collateral securing the Promissory Notes and the Acquired Promissory Note. On June 24, 2019, we entered into a Forbearance Extension Agreement with the hardware supplier, under which the hardware supplier agreed to pay us $7.4 million on or before June 24, 2019. In consideration for the $7.4 million payment under the Forbearance Extension Agreement, we agreed to temporarily forbear from exercising the remedies available to us with respect to the collateral securing the Promissory Notes and the Acquired Promissory Note until July 10, 2019. On June 24, 2019, we received a payment of $7.4 million from the supplier for the partial satisfaction of amounts due under the Promissory Notes and the Acquired Promissory Note. On July 15, 2019, we received an additional payment of $25.0 million from the supplier and converted the remaining $5.6 million outstanding notes receivable balance into an equity investment in the hardware supplier. We have concluded that the $5.6 million equity investment does not meet the criteria for consolidation and will be accounted for using the measurement alternative. Under the alternative, we measure investments without readily determinable fair values at cost, less impairment, adjusted for observable price changes from orderly transactions for identical or similar investments. As a result of the payments received, we reversed the $3.3 million reserve related to the October 2018 Promissory Note that was previously recorded during the three months ended December 31, 2018. The reversal of the reserve was recorded as a reduction to general and administrative expense in our condensed consolidated statements of operations during the three months ended June 30, 2019. As a result of the $25.0 million payment received and conversion of the $5.6 million outstanding notes receivable balance into an equity investment on July 15, 2019, we recorded interest of $1.7 million within interest income and a gain of $6.9 million within other income, net, in our condensed consolidated statements of operations during the three and nine months ended September 30, 2019, related to the Promissory Notes and the Acquired Promissory Note. As of September 30, 2019, there was no remaining outstanding balance of the Promissory Notes and the Acquired Promissory Note. As of December 31, 2018, the outstanding balance of the Promissory Notes excluding interest was $3.3 million and was included in other assets in our condensed consolidated balance sheets prior to any adjustments for impairment.